Pipers no longer go for same rat

Instead, if another piper is closer to the rat they have chosen to be their target rat, they will disassociate themselves from that target rat and instead target the rat that's farthest away.
NOTE: this may sometimes look like the piper is indecisive, but this is because if a different rat gets closer in the meantime (that is the one true love of this piper and not cheating on it with any other pipers), it'll choose the new one.