Case Play

[Nevadaref]

Art,
First the defender didn't shove anyone, it was the ATTACKER.
Secondly, you can only call a hold if contact is made by the defender. If the defender impedes/obstructs without making contact the correct restart is an IFK.

EJ,
In the USSF publication Advice to Referees on the Laws of the Game your sitch is covered:
"12.32 Sequential Infringements of the Law
If the referee has decided to stop play for an infringement of the Law (foul, misconduct, offside, or other reason) and another infringement of the Law occurs between the making of this decision and the actual signal to stop play, this subsequent violation must be treated as misconduct and handled appropriately."

This manual is downloadable for free from the USSF website.