Ok, for our next turn, here's what I'm thinking, assuming we lose 2-3 knights from the magic missile.
We charge the harpies with the knights that are left
Steam tank stays put and takes a shot at the hydra again
If the Demi's on the right are within 17" of the dark riders on the right, we declare a charge and see what the reaction is.
We move our right knight unit up on the hillto threaten the shades if they move forward.
We shuffle our reiksguard to the right and angle them for a turn 3 charge into the middle.
Our knight bus shuffles back a couple inches.
Demi's on the left start to angle inward, but stay back from executioners.
We hope the comet comes down with a normal range.