KotS_Zombies question for other DMs_Possible Spolier

[scadgrad]

I don't have KotS in front of me, but I'm 90% sure, it says that you are now Immobilized, nothing about being restrained. I don't recall seeing any bonus for hitting an immobilized target. I'm not sure whether or not the grabbing zombie can attack or not, granted that maintaining is only a Minor Action I can't see why he wouldn't be able to (and with a healthy bonus I should think). ATM, I would likely have him maintain and slam, maybe a few other zombies would join in (though I can see 8 of 'em gettin' in on the party) and surely one of them would get CA from flanking.

Fingers crossed, maybe it's explained better in the PHB.