If he gets stunned (in my case from ork weirdboy) while casting leap, he'll move upwards but keep his ground abilities and animations. Now he's walking on air .
After casting leap again he jumps even higher but bounces back to the normal height.
Oh and now he no longer fights after landing, just goes near them and does nothing.
I tried to replicate the bug but I can't find the timing, happened against orcs/eldar (weird boy/macha stasis?).
Kyre is flying forever now, he is a true angel.http://prnt.sc/f4j0ii
If you fly again and land, you can no longer attack. Because true angels only want peace, Kyre becomes a peacekeeper.