Illaoi's Test Of Spirit and the Effects of Recall

I've noticed an oddity where if you use Test of Spirit on an enemy that is recalling it won't cancel the recall. Which is reasonable, you haven't dealt damage, the problem comes where leaving the area causes the spirit to instantly disappear and turn the enemy into a vessel. Example: I assisted a Teemo from mid lane near my base while he was split pushing top at the enemies inhibitor turret due to a strong slap from a Tentacle. A possible fix would be either to have it cancel the recall or to have it so that (similar to Fiora) you must hit the spirit once for the vessel to proc upon leaving the area. (I'm in favor of the latter personally.)