Well, by the rules... a sleight of hand check is opposed by a Spot initially on the target, or a search if they are later frisked.<br/><br/>Since the guard couldn't exactly see anything (nor really communicate that), she just thought she was being tapped gently before Shiro left the cloud. Tashi also didn't notice it in the smoke. A search would have taken more than the few seconds he had before it was set off.<br/><br/>Moreover, it was stuffed underneath her armor, in her pants, ect.<br/><br/>Energy Resistance to your primary element starts at level 10. For the moment consider combat between Shiro and Tashi ended. He can't see through the smoke and he figures he's wasted enough time, especially now that the whole village is alerted.