Why didnt Hulk's arm heal after he snapped? Because the character in Endgame isn't “The Hulk” it's more like some sort of midway
They both share a rare combination of genetic factors that even allow gamma radiation synthesizing, but Bruce is surprised to learn that She-Hulk's is unique. He is able to use these findings to heal Smart Hulk's arm fully. This is how Smart Hulk is able to return to his peak condition.
Because the Infinity Gauntlet that Thanos had used was made of Uru, which is one of the most powerful metals in the MCU. It helped contain most of the energy so it wasn't as dangerous for him as it was for Hulk with the Nano-gauntlet because it was as durable.
Hulk was able to survive because of his exposure to high amounts of gamma radiation, and if Tony was living with the power of the Tesseract lodged in his chest, the same logic should apply. If Iron Man was empowered by the Infinity Stones, using the Infinity Gauntlet shouldn't have killed him.
If Hulk lost his arm to use the Infinity Gauntlet, why did Iron Man not disintegrate when he used it? Hulk didn't lose his arm, it just got burned pretty badly. This happened to Tony's face too, the only part of his body which wasn't covered by iron man armour.
After Tony snaps his fingers while wearing the Iron Gauntlet, he's transported to a mysterious place. As he tries to gather what's going on, he hears a voice call out to him. Tony turns around to see a grown-up version of Morgan, played by Langford. Tony quickly realizes the young woman is his daughter.
The Blip occurs at the end of the film in Wakanda, where numerous characters are blipped, including Bucky Barnes, Nick Fury, Maria Hill, Wanda Maximoff, Peter Parker, Stephen Strange, T'Challa, Sam Wilson, Peter Quill, Groot, Drax, and Mantis.
Hulk brought back everyone who disappeared at the end of "Infinity War" with the snap of his fingers. Some fans asked what happened to people who disappeared mid-flight. Did they return unsafely in the air? Marvel Studios' president, Kevin Feige, told Empire Hulk wished for everyone to return somewhere safely.
Following his resurrection by the Challenger, if Banner should die, he would self-resurrect by transforming into the Hulk at nightfall.
Sedative Gas: The Hulkbuster armor contains Sedative gas in the wrist of its right arm to spray at the rampaging Hulk to (hypothetically) put him to sleep.
Thanos vs MCU Hulk
The polished fighting style of Thanos proved too much for Hulk and his overall brutality and savagery. Hulk had the upper hand for all of two seconds due to the element of surprise before Thanos was able to finish the fight with a few quick blows.
He doesn't. He avoids fighting the Hulk because he considers the Hulk a nuisance. In every one of their encounters Thanos clearly was the one with the upper hand, and has made the Hulk look like a chump. The only Hulk that could stand even a remote chance would not be World Breaker Hulk but Doc Green.
Thor couldn't snap the gauntlet and bring everyone back because of his mental and physical state. The gauntlet not only takes physical strength but also mental strength and to be honest Thor was lacking in both departments in Endgame.
Marvel fans know that Hulk seriously injured his arm after he used the “new and improved” infinity gauntlet to bring back all of the people that disappeared during the blip with a snap of his fingers.
Because of the thickness and strength of the Hulk's skin, it's nearly impossible for any form of artillery to hurt him. Sure, everyone's seen bullets bounce off of the Hulk, but when we say he's bulletproof what we really mean is he's BULLETPROOF.
The Hulk's permanent injury from wielding the Infinity Gauntlet emphasizes its power and suggests that he may even be immortal in the MCU.
Marvel Comics has explained the Hulk's return with the reveal that the hero is actually immortal. Apparently, he always has been. The prologue of Avengers #684 highlights other times that the Hulk or Banner has died, beginning with Banner getting hit with the gamma bomb.
As you know, Bruce is a pretty thin guy, so we assume his junk is pretty standard — but The Hulk's junk is going to be massive. This is going to make sex a real gamble because you might end up with a 20-inch-long and 7-inch-wide veiny rod of tissue in one of two orifices . . . neither of which is going to pleasant.
1 Breaker Of Worlds
Not to be confused with Worldbreaker Hulk, the Breaker Of Worlds is the Hulk god. In the far future of Marvel, Hulk becomes more powerful than the Devourer Of Worlds Galactus. This is Hulk's ultimate form.
For starters, it takes place earlier in the MCU timeline than Far From Home, not to mention the fact its narrative is focused on Wanda, someone who lost a very important person in her life not directly through the snap, but as an indirect victim of it.
As he explained in the movie, he "put the brain and the brawn together." And in a strange way, it's a shame that the Hulk may never be able to go back to his iconic, angry self. The most interesting part of Hulk's character is the dichotomy between Hulk and Bruce Banner -- the Jekyll and Hyde dynamic.
Bruce's original love interest was Betty Ross, so it is possible that Liv Tyler's character is who he saw. There is no confirmation that Hulk even saw anything when he snapped his fingers in Avengers: Endgame, but if he did, it is likely he saw one of these two important women in his life.
Wanda tried her best to protect Vision from Thanos during the battle of Wakanda, but she was no match for the Mad Titan. (In fairness, Thanos had just acquired the sixth and final Infinity Stone.) Five years later, after Wanda had been blipped out existence with half the universe, the Avengers brought her back to life.
Perhaps the most plot-important after-credits scene in the Marvel Cinematic Universe was Ant-Man getting stuck in the Quantum Realm during the Snap.
Why was Captain Marvel not snapped? That's because she was pulling energy from the Stones to give her a power boost, which also explains why she didn't flinch when Thanos punched her.