If you have the clothes of a guard on they won't look after you. So if you walk in their field of view they don't stop looking around and only look at you. And the thing with strangling is that the guard you strangle mustn't see you either (the idea is that you have to come from behind them...) which can occur seemingly at random because the field of view has a 'interesting' shape. But thanks SO much for you feedback I'm so happy someone else finally played my game! I can't thank you enough!