Just watched this movie. EXCELLENT 9 stars but here is my one criticism

I just finished watching this movie on Netflex and it had me on the edge of my seat the whole way through. It perfectly epitomizes a stellar horror film in my opinion. I like the added element of mystery to the horror elements. I think the element of mystery added in created a lot of suspense. Usually, the horror film reveals the evil nature of events and lets you know what's going on, but this added a lot of clever mystery in that we didn't know exactly what was going on with the characters coming up missing at all. I loved that element. I especially got freaked out when the girl asked the first sister who was shown who the person was behind her. That freaked me the hell out.

My one and only criticism as far as this movie goes is why didn't the spirit throw and toss around the old man living in the house if she was able to throw and toss around the sister around like a rag doll? Couldn't the spirit living in the house just as easily tossed around a 90 year old something looking man if it was able to toss around young healthy looking women?! Why go after the girls who were none the wiser instead of the person she clearly has a beef with. She could have easily killed the girls judging by the way she is able to supernaturally pick up and toss around the girls. That element of this film made no sense to me. The spirit seemed to be kind of a dumb@zz.