My tuppence worth!
First red, is not a straight red in my book, mis timed and full blooded, but going for ball, assume its been thought to be dangerous play? Yellow would have sufficed for me
Red for Gemmell seems ludicrous, calmly moved the players away, and had no other dealing in the situation to that point, unless hes called him a "useless c**t" or something in the short conversation they had, its just a bad decision