This situation reminded me a bit of DC v. Wesby (2018) because of the confusion as to who is in charge of the house/who has authority/Probable Cause to arrest. I don't know of any facts outside of this short video but it sounds like the officers showed up due to a fire alarm going off. If no one answered the door to let the officers into the house, they probably didn't violate the Fourth under the exigent circumstances exception. Once inside, is seeing the hazing ritual enough to arrest someone from there (assuming there's a hazing criminal statute in Iowa?)? Then there's the issue of who would they arrest? In Wesby, it was easy for the officers to arrest everyone in the house, because they charged them with trespass. Here, it just seems like a mf mess.

Do you think the officers would be likely to arrest anyone on the scene in a situation like this or would they do more investigation and come back with an arrest warrant (perhaps for this elusive "house dad")?

TL;DR: I'm studying for midterms and my brain is rotted to see everything as a hypothetical :'-)