Multiple fouls on scrimmage kick

[stegenref]

This happened to my crew Friday night....I just want to make sure we got the penalty enforcement correct.

K1 punts from the 50 yard line. R1 fields the punt at his own 20 yard line. R2 blocks in the back at the 15 yard line. As R1 is being tackled at his 30 yard line, K2 grabs and twists R1's facemask. After the whistle blows and everyone is unpiling, K2 gives a rough shove to R1 as he is getting up. So we have three flags on the ground....block in the back, 15-yard facemask, and a dead ball personal foul. How do you enforce?