Since pass was blocked at the LOS, the call must be that the pass had not crossed the NZ, or that the B tip occured prior to the hold, therefore it's 10 yards replay 2nd down.
Rule 9.3.4.e When a legal forward pass crosses the neutral zone during a forward pass play and a contact foul that is not pass interference is committed beyond the neutral zone, the enforcement spot is the previous spot. This includes Rule 9-3-4-c (A.R. 7-3-9-I and A.R. 9-3-4-I and II).
PENALTY—10 or 15 yards from the previous spot, plus first down if the foul occurred against an eligible receiver before the pass was touched [S38, S42, S43 or S45].