User blog comment:Fairingrey/March 20, 2015 Another Tiny Future Content Update + Wiki Stuff/@comment-69.237.147.161-20150328225930/@comment-25036392-20150329000414

Hmm, what about procs? Some units hit more often whenever they happen to use a skill which can mess up the hit counter.

Also, if you have any more questions regarding this event, it might be better to ask them in the Ariel's Bingo Challenge comments section.