Huggy's right. Immediately following the incident, Roush said he was trying to go around. It was likely an attempt to salvage an overshooting approach and a late decision to go around. Numerous folks who've been given the same pattern/landing instructions usually reply with an "unable" and demand 36 or overflight of 09/27.
Glad the only fatalities were the jet and his pride. I mean it's one thing to stall your jet in, but to do it show center at Oshkosh...ouch.
EDIT: FWIW, after the a/c came to a stop, I distinctly remember one or both of the engines being at or near full power (at least that's what it sounded like to me) for approx 20-30 sec before he was able to shut 'em off.