The problem with a "What the hell are you dong", is that it means you have a 30% chance of getting an answer, and a 70% chance of being killed.
Considering the safety of the entire crew (and more importantly the Station) could be at risk, unless its something super minor (such as standing in suspicious areas), I'm going to flash/stun and cuff you. Then I'll ask questions when their is zero risk of having my head blown off.
If you haven't done anything wrong then you have no worries, you'll be out of Sec quick and have an interesting RP experience explaining why you were dissembling the Security Camera.