Tahm Kench Devour wouldn't devour one teammate halfway through the game.

His 'w' worked through the early game, but as mid-game rolled around I wasn't able to devour one specific teammate (who happened to be the adc). It was not on cool down, and it was working on all of my other teammates. I don't have a clip of it not working, because the replay never shows me devouring him, obviously. I left the game and reconnected and this didn't help either. The game was on 10/23/2017 at around 11:00 PM Mountain Time. The summoner name is Major Th0m.