Regardless of mana and aura cost, Ainsworth used Freedom Of Movement (SSS) to go from convenience store to convenience store, and mall to mall.
He also didn't let go of department stores and whatnot. As long as it was a place with rich supplies, he emptied it.
To prevent others from seeing and recognizing him, Ainsworth also activated Presence Concealment (A) and Disguise (C) at the same time.
Even if he used Freedom Of Movement (SSS) for instant and unrestricted movement, his class trait which turned it into a passive skill had drastically reduced its mana or aura cost so Ainsworth wasn't drained.
In just under ten minutes, he looted every useful supplies he could find within the city.
While he was moving from building to building, he spotted survivors but ignored them, focused solely on hoarding. Because of that, during those ten minutes, his hoarding was uneventful.
Once his scavenging spree was complete, Ainsworth paused atop a mall rooftop, gazing at the streets below.