All he hears now is a constant ringing because his eardrums and shot!
This is exactly why you don't overfill a tire.
They almost blow themselves up multiple times.
Don't try this at home kids.
Don't overflow your gas tank!
Door closing + gas fumes + fire = combustion = Boom!
After multiple tours of duty, gunfire and bombs are just an everyday thing. You need to develop a thick skin to deal with war. Wait for it.