My thought would be a transmutation mage of some kind. Basically using the same idea of the slowfall spell, where you're not actually making an object lighter (IE, you're not reducing it's mass to make it 'float' to the ground) but you're instead manipulating the time it takes for whatever is slowfalled to hit the ground. It feels sort of like proto-chronomancy to me, but the precedence of slowfall and how it functions kinda shows that in theory it should or at least could work.
The immediate caveat that comes to mind is the potential of it being overpowered, though that might be addressable by ways of making it very clearly draining and only working within a certain distance (couple meters or some such). Maybe make the magic prone to misfires or even backfires.
