Joyce was walking towards the umpire dressing room when he saw Powers begin to shake before falling to the ground.
"I knew something was wrong," Joyce said. "And I knew if something wasn't done, this lady could actually die in front of me. It was more instinct than anything else."
D-backs executive Roland Hemond called Joyce over to the screen behind home plate during the game to let him know that Powers had regained consciousness and looked like she was going to be OK.
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