Sorry, but, nothing shady about it. Water does not leak "up". The leak was in your bathroom. Water was probably dripping onto the drywall ceiling in the apartment below you. This causes a nasty water stain that is hard to paint over and, if left long enough can cause the drywall to have to be replaced. So, yes that would be an emergancy repair and they had every right to come in and make the repair. You knew there was a problem that needed to be fixed. He stopped, found the leak, tried to call to let you know he was coming and then came to fix it. Sounds like you were the negligent one, not him. On a side note, the apartments I've lived in had chains on the door so they couldn't walk in on you.