B can call fair catch on a grounded kick? That seems odd, but perhaps they're trying to protect the receiver on these plays.
New NCAA rule (emphasis mine):
Rule 6-4-1 (FR-66)
Add new paragraph e:
e. During a free kick a player of the receiving team in position
to receive the ball has the same kick-catch and fair-catch protection
whether the ball is kicked directly off the tee
or is immediately
driven to the ground, strikes the ground once and
goes into the air in the manner of the ball kicked directly off
the tee.This is accompanied by an exception in paragraph a regarding
the kick touching the ground.