Here’s the rule regarding what happened to start the 2nd half
RULE 7 BALL IN PLAY
SECTION 2 DEAD BALL
ARTICLE 1. DEAD BALL DECLARED.
(d) when a runner declares himself down by:
(1) falling to the ground, or kneeling, and clearly making no immediate effort to advance.

— trey wingo (@wingoz) January 5, 2020