He's airballed FTs before, so this is no big surprise to me. I remember sitting in Keetch's amazing seats and watching Diop walk up to the FT line. I leaned over to my girlfriend and whispered, "Watch the airball." Sure enough, two feet short of the rim.
Lots of big men airball FTs. I've seen DeAndre, Dwight, Chuck Hayes, Shaq, etc air the hell out of some shots.