This a hero academia rp right? Where people with crazy quirks are still inhumanly fast and agile despite quirks not pertaining to such benefits. 
Whats really to say Midnight with his powerful mind and quick perceptions didnt just bend down and stop the shotgun from aiming upwards. 

Even if he wasn't in line he was still next to Skull and speaking to them. The antidote also wouldn't be necessary cause Midnight doesn't have a body to infest. Insects that touch his 'skin' would shrivel up as they come in contact.

So lets say all this is true. Id wager Midnights fast enough to stop Slull from angling his holster high enough to shot the kid anywhere but in the legs, preventing fatal damage but maybe still getting a pretty nasty fleshwound.

What say you to this thought, despoiler of decorative nicknacks and good times! Lol