Re: Hiding from the Police
You shouldn't put your roommate in the position of covering for you, and potentially being charged if he is found to be actively misleading the police about your location.
The regular city police could have been there to arrest you on the warrant. With six officers arriving, there's also a chance that you're wanted for a new criminal offense.
If you were caught hiding on the roof, you will already know if you are facing any charges as a result of your actions on the day at issue. If not, then the police won't know what you were doing unless you or your roommate tell them. Perhaps you could complete your thoughts and ask a clear question.