One of those horror movie which characters do stupid things

The ending omg!
At least 1 death could have been avoided if the main girl just run and put the head back when the guy gave her. Then she has a second chance to again quickly put the head again, but noo. She rather cry and do all of this slo mo and the guy ended up being eaten by the monster, all his pain could have been avoided.
The monster is so strong yet can be beaten by the main girl while the boys were struggling to get a hold of it. Like what ?
I'm so mad I wasted my time watching this.