Details in comments (He's fine now)

So, we have a workout routine where we do pull ups. This man decides to full send some chin ups while I'm laying in bed doing schoolwork. All I can see/hear is a yelp as he and the bar dip behind my screen. Yes, the floor is brick.

Head and elbows made contact.

And this is why I never want to buy those

He was just being an idiot, they're normally safe.

Still I don’t trust those screwless bars

It's very secure as long as you don't try to throw yourself at the damn ceiling and use it like a normal human being (I can understand your apprehension though, seeing as you are a massive radioactive iguana that cannot fit in doors.).