@Frozen
Completely plausible. Not necessarily a good idea, but it can be done.
Plus in my example it's nowhere as fatal a dive as from a Massive Dragon. Just an Aerial Takedown or something.
birds IRL (yes, I know elements is an extremely abstract game, and I appreciate that) that dive for their prey, like eagles, tend to use their wings to glide, or at least stop themselves from dying on face-plant-contact. Point is that at least something should be done for creatures still using dive ability after not being able to fly. There's a reason that only flying creatures are affected by sky blitz.
Hawks: they dive onto their target, grab it, then fall down (controlled fall, but still fall) with the prey to the ground, never once releasing it.
But as I said, you don't have to go to fatal heights to increase damage done. If you jump down from the first floor (being the first floor above ground level) onto someone, you can easily survive with no harm. Your target not so much...