You fail. His initial velocity would have been horizontal, the descent is vertical. Assuming he accelerated at 32.2 ft/sec/sec in the vertical, starting with no initial vertical velocity he would go splat in squareroot( 2 x 600 / 32.2) = 6.1 seconds. In that 6.1 seconds, again assuming no horizontal acceleration he would have gone about 358 feet in the horizontal.
Damn, you guys beat me.
You fail.
That's not very nice.
It's deferred success.
You forgot to include the amount of time it takes you to realize that you don't have land underneath you. That always delays the effect of gravity. Or at least that's what the professors at Warner Brothers University taught me.