
Archaeik |
I think the only thing you'd run into is soft cover, but only if you are attacking through your ally's square. I'm not seeing any SQ that would cause shared damage.
Also, keep in mind that the 2 creatures never occupy the same space.
During a grapple, the limb(s) it uses for its slam is occupied, it has 2 options:
-Release the grapple and make another slam attack (along with a new grab, and constrict)
-Maintain the grapple, choosing an option: damage, move, or pin. (also dealing constrict if successful)