UFC Abu Dhabi video: Valter Walker picks up 5th 1st-round leg lock submission in a row, calls out Herb Dean: Valter Walker didn’t get a heel hook this time, but he added another leg submission to his trophy wall. Walker faced Thomas Petersen in a heavyweight preliminary matchup at Saturday’s UFC Abu Dhabi event. Petersen landed an early takedown within the first minute of action, but Walker was able to transition into a heel hook. […]