There's not enough space for Syrlya to try and wedge between the two of them, so he's gotta hope Lambert doesn't get his throat ripped open. Instead he waves his hand to create a magic circle under Shamshel that's meant to cause pain and injury in a series of pulses for a few seconds.

And then he'll teleport his position more towards her back while she face's Lambert so she doesn't have obvious focus on both of them.