He knows what pocket the comm is in, right? Where the pocket opens? Do they have patch kits for their suits, to repair minor damage?
Shut down suit pressure, or turn it way low. Ignore the warning hooters. Cut a small incision right over the pocket seal-rip or whatever. Quickly fish out the comm, while the the other brother stands with a patch hovering ready over the cut. Once the comm is out, slap on the patch. Apply a bigger one over THAT patch. Wait the necessary couple of minutes for the patch to cure, living on what's left of your suit air (it all wouldn't have gone out that little cut in that short time, just like a bullet hole in a plane doesn't depressurize the whole craft, that's a myth). Then increase it slowly while watching the patch. If it leaks, slap on more sealant. If not, raise pressure to normal, connect your comm to your suit, and start yelling for help. I doubt you'd die or suffer major injury from a small incision, that's why they have patch kits. Otherwise, a small bit of damage would be instant death, and they wouldn't bother to have them, they'd be pointless. I think, worst case, he'd have a hickey right under the incision, but I doubt he'd have that, since there'd be fabric between vacuum and the skin.