Nor can Kestrel do anything about the dimensional travel other than hold tight to Kulpa.

How disorienting.

Here they are somewhere else. Small cell. Closed. Concrete, likely vulnerable to sabotage given some time. Normal gravity. Air pressure and apparent composition within normal bounds. The sprite has no obvious escape route. It's still in the same relative position as when they teleported.
Fire. Zzap! No, no, the heat ray makes more of a FWOOSH! sound.
Another free small-arm loops protectively around the child, while the other small manipulator not used for walking or weapons tries to peel the sprite's hand off of him.