Might just be Birch generally. Have a look at the end of the 3rd when Lake out marks Tippett in a one on one. Birch goes up to Tip and gives it to him.I sensed a reasonable amount of dislike there too. Birchall was stern-faced about the whole thing...suspect they either didn't really get along when playing, or the defection was seen by Birchall in a particularly bad light.