[GAMEPLAY] Heimi's turrets drop out of Tahm's belly.

In a recent game I was playing against a / botlane as supp.
When I used my W-Devour on Heimi's turrets they occasionally would occasionally fall from my belly and just sit there, on the ground. Tahm would change back from red to green after this happened, and the turret would be unable to be reduced to zero hp (they wouldn't die, no matter how hard my team tried) for what seemed to be around 3-5 seconds. I think the game registers them as "in mah belly!" still, and this causes the death immunity, but I am unable to explain why they drop out of Tahm before his devour is expired. For replication:

1. vs
2. Use Tahm's Devour on Heimerdinger's turrets.
3. Run away from each other, as this seemed to cause it most often in game.
4. If the turret drops out of Tahm's belly, attack the hell out of it. Some extra champs attacking it may help make its invulnerability more obvious. Although this happened quite often, I didn't have any recording tools on, so I cannot post screenies or vids.