The rule you quote says the ball remains "in play" (ie: live).
The other place this rule is addressed is 8-6-4, which notes that "the ball is in play and the (assisted) runner is out".
The infraction of assisting a runner isn't listed under Rule 5, which covers all dead ball and delayed dead ball situations, nor does it appear in either the dead ball or delayed dead ball tables.
A reasonable person could conclude from those rules and tables that NFHS does not consider this to be a delayed dead ball situation. That is, until you read their Case Book...
Case Plays 3.5.4 A & C both instruct the umpire to "declare a dead ball once the play has been completed".
Isn't that exactly how a delayed dead ball works?
