The Qb rolls out to the right. The WRs on that side run a short and deep route to occupy both defenders. The offensive lineman on the far left allows his man in to rush the QB. The QB pretends to be flushed out of the pocket. Meanwhile, the lineman drops back and waits for the pass. The QB throws the ball back to the lineman as the dotted black line shows. The lineman then finds the WR on that side going deep for a touchdown.
If the play breaks down and the QB can't throw it back, or the defense sniffs it out and covers that lineman, the QB can just tuck the ball and take off running, or pass it downfield to anopen receiver. The defense may have bit and figured out the play, so there may be an open receiver downfield.
Very tricky, very effective.