Occasionally, Tahm will use Devour on a minion and it will disappear. The Tahm will turn red and walk around slowly like normal for only a brief moment before reverting back to normal with Devour being put on cooldown. This bug is intrusive because it wastes the Summoner's Mana, takes away poke damage, and wastes potential gold for both the Summoner and allies if the Summoner has a Relic Shield item.
This bug has been active since patch 7.22 and has continued to be an issue through today, patch 8.1. This is the second time I have reported this bug.
To repeat this bug:
-Cast Devour onto a low-health enemy minion.