Boxing out on a rolling pull

[Big D]

I looked over the rules again, but I didn't see anything that
specifically dealt with this situation

Team A pulls to Team B on a windy day. A's pull lands near midfield
and starts rolling toward's B's endzone then does a 180 and heads back
towards team A. B's handler has been hustling to get to the disc and
boxes out (shuffles his feet, stays between the player and the disc
with no or very little contact) his prospective marker to prevent him
from stopping the disc, thus gaining another 10 yards or so.

Is this against the rules in any way? Is it considered unspirited?

[Hank]

I don't believe it breaks the rules. The pulling team may not touch
the disc in the air, but there are no provisions from stopping the
roll while down on the ground (if you can get to it)

VIII.B.5 A player on the throwing team may not touch the pull in the
air before a member of the receiving team touches it. If this
violation occurs, the receiving team may request a re-pull
immediately.

XVI.E Any player may stop a rolling or sliding disc, but advancing it
in any direction is a violation.

XVI.H.3.c.1 When the disc is IN THE AIR a player may not move in a
manner solely to prevent an opponent from taking an unoccupied path to
the disc and any resulting non-incidental contact is a foul on the
blocking player which is treated like a receiving foul (XVI.H.3.b).

XV.A A player may bobble the disc in order to gain control of it, but
purposeful bobbling (including tipping, delaying, guiding, brushing or
the like) to oneself in order to advance the disc in any direction
from where it initially was contacted is considered traveling.

[Colin]

I don't think it is all that dissimilar to interfering (in a non-
blocking-foul way) with a player trying to catch a floaty pull, which
I'd think is kind of weak.