Ending a period

[jaybird]

3-4-6
ART. 6 . . . When a team attempts to conserve or consume time illegally, the
referee shall order the clock started or stopped.

[NorCalRef12]

Right, if you feel that B intentionally encroached with 1 second left, the referee can order the game clock stopped and only have it start on the snap.

I have actually called delay of game on B in a similar situation.

A had just run for a second down to the B5. There were about 15 seconds to go and A was hustling up so they could spike the ball. As the last players are getting out of the pile there were about 7 seconds left, B1 slaps the ball away so that it will take longer for us to get the ball and mark it RFP. I killed the clock and flagged B for DoG. B ended up stopping A from scoring, but A was able to get one more play off.