All the other kids with the pumped up kicks
You'd better run, better run, out run my gun

Just jump the dude as soon he opens the door so he won't have much time to react and get his gun off of him asap, and then if you manage to grab the gun finish him by shooting.

Its nice to see a fan of TBT games making wonderful pixel art. A rare bread indeed.

You can win but at a phyrric victory. Group and attack all at once. Sure, a lot will die but someone MAY survive. However, morale is obviously low thus the group attack MAY fail.
Another way is to block the entrance via the nearby chairs and tables if it was able to be grabbed. Again, it will be a phyrric victory.

It is always a phyrric victory but the class can survive.

Another tactic is to hide behind cover, unless the killer wanted to kill someone in there, then you're screwed. It will only happen in hard difficulty but in easy difficulty, the killer will not bother you and you will pass the level.

PS. This comment is based on the art itself. A real life school shooting is hard to overcome as it is unusual and unpredictable, thus using the tactics above will cause casualties either way. For your safety, please have a number of the police or someone who knows a trusted gun owner, a retired soldier or police officer to come and fight for you.

Admins, pls don't ban me. I'm just sharing my opinion.

This is a serious topic, but still, nice art.