tumble dc 25
Tumble at one-half speed through an area occupied by an enemy (over, under, or around the opponent) as part of normal movement, provoking no attacks of opportunity while doing so. Failure means you stop before entering the enemy-occupied area and provoke an attack of opportunity from that enemy.
Check separately for each opponent. Each additional enemy after the first adds +2 to the Tumble DC.
这个有啥疑问么?