QUOTE (DG @ p.17)
While it cannot create auras or astral forms where there are none, it can change the impressions gained from Assensing, the Psychometry or Sensing metamagic, the Astral Window spell, the Magic Sense adept power, and other magical senses.
Can it hide auras?
Similar, can i use "Trid Phantasm" to conceal a group of people through displaying the illusion of an empty sidewalk?