The incident happened in the top of the fourth with Ryan Doumit at the plate with Roy Oswalt ready to deliver a 2-2 pitch.
Twins leftfielder Josh Willingham, who was at first base at the time after drawing a lead-off walk, immediately went to all fours before sprinting to the visitor's dugout with coach Jerry White right behind.
The umpires delayed the game and grounds crew put a tarp on the infield as a 46-minute rain delay began. When play resumed, Rangers rallied to tie the game and eventually won it with a walk-off single by Ian Kinsler in the 13th.
