The rule: Camping is not allowed and Do the mission, is in my eyes like this: Basecampers with AWP = Slay. : When u have the bomb, and do not plant it but camp until the time almost is done, and u have no time to plant: Slay. But if you're the only alive guy, and the terrorists have planted the bomb, only the most skilled guys try to defuse, not to mention that, some guys like me ain't skilled and save money to buy a gun, and then just loose the gun, because the admin can't wait for the bomb to explode?
Before taking actions you should just look the point of view. It doesn't matter if you spammed the chat with defuse, or w/e, if the chance is only 10% to defuse, you do not defuse. Simple! And ofc I would hide somewhere, because if T is smart they'll know where he prolly is camping and go and kill him.
But neither I belive any action should be taken for this. 1. the evidence is a screenshot of somone getting slayed, 2nd it's not logic taking rights or w/e because he slayed him for that reason.
A Warning that he should just be carefull with slayings, and if he's not sure if he camped all the time or not, then better not slay, to avoide people getting pissed of for nothing.
=)