system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Can the Dr. Banner be killed if he's unaware of a threat?

He says he tried to shoot himself and it failed, but he knew what was coming.  Same when he jumped out of the helicopter or was thrown in the pit by Widow.

What happens if someone snipers him from a half mile away or if Project Insight had come to fruition?
gpt
The 2008 film *The Incredible Hulk* is seemingly meant to be part of the MCU. Banner's whereabouts at the end of that film correspond to the start of *Avengers*, and they even use clips of the film in background TV screens during *Avengers*.

That film went into more detail about Banner's transformation being based on stress -- not necessarily just rage, but **any** stress, including fear. This would explain why he reacts instinctively to shooting himself, transforming to survive.

Because of that, yes, it seems probable that he'd die if he were sniped while calm.

Reminder for sanity: please do not confuse the Edward Norton 2008 *Incredible Hulk* film with the Eric Bana 2003 *Hulk* movie. The latter has been known to turn viewers into mindless green rage machines.