[Gameplay] Kench vs. Donger

Was in a match a few days ago playing Tahm Kench support, enemy team had a Heimerdinger mid. About 20 minutes in we were pushing them back and I decided to use Kenchs W, which is his eat ability, on one of his turrets to spit it at him. So I ate the turret and it instantly dropped it, and when I tried to kill it, it became invulnerable at 5hp so it kept shooting me and killing me but I kept attacking it and it wouldn't die. This was one of his normal Q turrets, not R+Q turrets.