Teemo VS Irelia

{quoted}

I = Ireleia S = Shroom T = Teemo

I---->S-->T, she did this movement through a dash but the shroom didn't go off

Hmm.. maybe because you putted your shroom too early? Because i know that when you put shroom you need to wait like 2 seconds until it's active. If it's not this case then probably because it's ''mid air'' dash it worked like that.