{GAMEPLAY} Tahm Kench - Rammus Interaction Bug

So a friend and I wanted to test some rammus - tahm strategies, and we started out by getting to level 6 to see if rammus could use his charge ball as he went into Tahm's ult. It turns out he can, but afterwards Tahm was unable to devour Rammus at all with his W. Wasn't sure if it was possible prior to the lvl 6 combo test, but wasn't able to do it at all the rest of the game. Tried dying with both champs to reset, and was still able to devour minions and other champs on enemy team.

If more information is required just let me know!