If Tahm Kench Devours an ally while a projectile is homing towards them
He now absorbs a percentage of the damage with the ally taking the remainder.
Have the percentage of damage absorbed scale up with Devour's rank and start out reasonably low.
The point is that catching an enemy out doesn't mean anything when Tahm can just give an ally a 6 second Zhonya's and ferry them to safety. Devour needs some sort of change to it because it does too good a job of erasing mistakes.
EDIT: I'm no longer replying to ridiculously dumb comparisons such as "lol what about flash????" or misrepresentations of my position such as "wow op wants nothing in the game to be able to pop projectiles just because he thinks Tahm's W shouldn't".