Brotherhood control tile left on board after finishing wave [Investigating]

DeNappa
DeNappa Posts: 1,368 Chairperson of the Boards
Noticed in today's DDQ: in the first wave we fought some iso-8 mutants, second wave some SHIELD goons.  

Well into the second wave I suddenly noted some purple countdown tiles that were left by the brotherhood control in wave 1.

i didnt end wave 1 in a spectacular way, just by making a tile match

//Edited Title -Brigby