Tahm Kench's ultimate seriously needs a fix

Right now, there's a bug with Tahm's ult where teammates see his ult still up even when it's on cooldown, so people might start flaming on their team's Tahm for not bringing them in. Another bug is that while Bard Ults a Tahm as he leaves with Abyssal Voyage, Tahm can Devour Gromp, spit it out, and eat an allied champion only to do damage to them. I like playing Tahm, and neither do I want people flaming for me not being able to go in and help, or accidentally kill my teammate.