Cagliostro and one of the amazons gate to the back of the tent.
Cagliostro expects that it would be boobytrapped.

Cagliostro examines the back of the tent - whatever methods he uses to
examine the tent (including the lens) give back readings of 10 feet
off to the side.

Cagliostro slips a fiber-optic probe through a burned hole at the
bottom of the tent on a smoldered part. Looking at the walls gives an
odd sense of vertigo for some as-yet-to-be-explained reasons.  The
brain records the walls as 'white' but shys away from closer
examination.

At each corner, the pole comes down and connects to a wooden stand.
On each foot is a large sandbag. Attached to the front pieces of the
tent two poles seem to be bunches of rope things, strung in between
the poles.  On the back wall, there is a waist-high pipe with a hook and a winch.