Talk:Mission Card No.02/@comment-12.130.169.124-20150805223435/@comment-26005122-20150806002713

It's because Alien doesn't actually remove a fourth Tsum from play. It simply takes them from the pile and tosses them all on top. It does remove them for a brief second, but during the skill activate animation, you're unable to continue clearing Tsums, so that moment doesn't count.