No doubt Shok has heard the commotion ahead but he won't make a move into battle in this instance until he sees which way the Wardens go. He'll hang back for a bit to observe so don't expect him to appear until a few posts in.
Once he makes sure Hissra is staying in place he will pretty much get right into the thick of things but until then he is just going to be waiting... watching you all. Judging you.