Things that do not have room for Amshalan:
Doors.
Hallways.
Most ordinary rooms, at least with furniture in them.
The mirror-mouth of this snake monster that is eating her Chosen.
They could iterate closer, but maybe instead they should try a different angle of comparison.
How does Vanyel feel about Stef (the elder) going through at two miles, with compulsions? As a fallback, they're now pretty sure they have some Elves who are unaffacted enough to go yoink him back.