Wait. Whut? So because you should jump of a cliff and save yourself by turning a dragon there is no falling damage?
Because the dragon slayers have been hunting flying opponents for the last 50 years (in a magical realm where there are levitation spells strong enough to keep large boulders floating in the air with fortresses built on them) it seems reasonable that at some point it would occur to someone that the slayers should probably incorporate levitation strong enough to control a descent into their standard abilities.