What we saw was Carabello controlling the distance in the fight with his right, and Walker trying to get inside. From the comments of the announcers, that had pretty much been the fight up to that point. Carabello had controlled the action, and had won the first three rounds.
At 2:25 of the 4th Carabello over extended himself and Walker stepped inside to deliver a left, Carabello countered with a flying knee that caught Walker flush on his chin and he dropped. The announcers sid Carabello had been using that combination all through the fight, and finally changed it up once he had Walker's timing down.
The rest of the results follow:
MAIN CARD RESULTS
- Eddie Alvarez def. Shinya Aoki via TKO (strikes) - Round 1, 2:14
- Andreas Spang def. Brian Rogers via knockout (punches) - Round 2, 3:34 - middleweight tourney semifinal
- Maiquel Falcao def. Vyacheslav Vasilevsky via unanimous decision (29-28, 29-28, 29-29) - middleweight tourney semifinal
- Rick Hawn def. Lloyd Woodard via KO (punch) - Round 2, 0:10 - lightweight tourney semifinal
- Brent Weedman def. Thiago Michel via split decision (28-29, 29-28, 29-28) - lightweight tourney semifinal
PRELIMINARY CARD RESULTS
- Jessica Eye def. Anita Rodriguez via unanimous decision (30-27, 30-27, 30-27)
- John Hawk def. Marcus Vanttinen via split decision (29-28, 28-29, 29-28)
- Attila Vegh def. Dan Spohn via split decision (29-28, 28-29, 30-27)
- Frank Carabello def. Donny Walker via knockout (flying knee) - Round 4, 2:25
- Julian Lane def. Joe Heiland via submission (guillotine choke) - Round 1, 2:49