[GAMEPLAY] Tahm Kench smiting during Devour

I was playing a bot game to pick up Tahm Kench jungle, and I was trying out a few combos to clear camps quickly. When I got to Gromp, I Q+W comboed to lick-em-up and hit smite while gromp was flying towards my mouth. I was able to smite it mid-air, but since TK's W puts the target in a stasis or whatever, it simply said "Invulnerable!", put my smite on cooldown, and smite dealt no damage to the gromp.

I'm not sure if this was intended, but if it was I would motion to reverse it. It's nothing but detrimental to the player since I'm trying to kill the big froggy, not save its life or anything. If we can't reverse it, then possibly disallow the player(s) from smiting or casting any abilities on the target that Tahm is swallowing. I'm unsure if this same phenomenon occurs during Tahm's normal W animation, but I would assume it has the same effect, just with a shorter window in which to trigger this effect.

I've uploaded a quick YouTube video demonstrating what I'm talking about.