  Understanding relaxation of supercooled fluids is a major challenge and
confining such systems can lead to bewildering behaviour. Here we exploit an
optically confined colloidal model system in which we use reduced pressure as a
control parameter. The dynamics of the system are ``Arrhenius'' at low and
moderate pressure, but at higher pressures relaxation is faster than expected.
We associate this faster relaxation with a decrease in density adjacent to the
confining boundary due to local ordering in the system enabled by the flexible
wall.
