Two Questions

[Theisey]

play-1) It's obvious that team-Bs coach is watching too many NCAA games as NF has no rule about breaking the huddle with twelve.
However, a replaced player must leave immediately, this probably didn't happen. Should be flagged for illegal substitution. But if you really did not see the sub enter the field, You'll have to take the heat from coach of team-B for missing this. I'm guessing the player was there from the getgo. You're wing man on that side should have noticed.

play-2) I might let the block in (a) slide, but not the block in (b). Clips in the open field are dangerous blocks.