While taking a ride from Borean Thundra > Icecrown the RAF toon DCed couple times yes. Also it helps to fly just above ground if you are about to move to other zone because it often dismount the RAF toon and it dies.
The DC aint quaranteed its just random (for me atleast).
Yeah yours was my experience too. One he dismounted and cratered. Another time I found him swimming. The oddest off all - floating in the sky (null character tho).
The bug is lame, but the response from blizzard is just absurd. The gist... "We are aware of it, working as intended"
If this is a way to encourage people to play your aging game...Way to go!