User blog comment:Darkcloud1111/The Bigger Story Behind the Story/@comment-11188061-20141019082638/@comment-3146930-20141019224924

However if the Grimm are able to sense strong emotions, they may pick up on the intentions of those waiting to pop out and kill them. This plan could also only work maybe a few times before those that survive the attack(s) begin to see a pattern and learn from it. The younger Grimm would obviously fall for it every time, but the older Grimm would know it is a trap and make a trap of their own.