Yngvar kept attention for the frozen places on the floor. Keeping attention not to fall is an underestimated thing to do in unannounced operations. For one thing, it keeps an operative from looking as what he is. It was just a mental trick, but the mind controls the body. Make the mind think of something normal people do, and the body is not sending danger signals that an official can perceive.<br/>Well, at least that was the theory. Yngvar had a more prosaic explanation why it is a useful technique, and it was that keeping your mind off the target just prevented you from exhausting yourself mentally, and exhausted minds tend to show things they want to hide. Some of his friends agreed with this opinion, while others didn't.