I was at my girlfriends apartment last night when we heard a girl screaming like she had just been attacked. A few minutes later we heard someone sobbing and heard her crying help me. Immediately called 911 but they did not find anything. She lives in a sketchy part of Boulder next to a halfway home and a block down there is a huge camp of homeless people who routinely go looking for trouble. Not the kind of place where you go walking alone at night. The thing that scared me is that we already had an issue where a homeless man climbed onto the truck parked under her balcony and walked into her house. Needless to say I did not sleep well last night and spent all night watching that door. Fast forward to this morning after I left and my girlfriend texts me a screenshot that the same night they saw someone creepy wearing a bunny mask walking by the circle K near her apartment. No idea if this is related but I know what I heard last night and I know those screams weren't fake. Anyways she lives in university housing so without a doubt no weapons allowed but I wanted to know if you guys had any tips for self or home defense just in case this creep comes back.