en_tn/act/09/04.md

he fell upon the ground and heard

Possible meanings are that 1) "Saul threw himself to the ground and heard" or 2) "the light caused Saul to fall to the ground, and he heard" or 3) "Saul fell to the ground the way one who faints falls, and he heard"

why are you persecuting me?

This rhetorical question communicates a rebuke to Saul. Alternate translation: "You are persecuting me!" or "Stop persecuting me!" (See: rc://en/ta/man/jit/figs-rquestion)