As near as I can tell, this is exactly what happened. The umpire called Time at 0:20 (but not before) while Seager was in the box with his hand up to stop Weaver from pitching. Later, he was holding up his hand in a Stop mechanic to indicate that he hadn't put the ball back in play yet. After some wiggling and some jawing, Seager was ready for the pitch, the ball was put into play (presumably around 0:43), and Weaver weaved.