twists one = ?

What does the "one" refer to?
Context:
HIV Uses Autophagy For Its Own Means
ScienceDaily (July 29, 2009) " Not satisfied with simply thwarting its host's defensive maneuvers, HIV actually twists one to its advantage, based on new findings from Kyei et al. in the July 27, 2009 issue of the Journal of Cell Biology. Vojo Deretic and colleagues suggest that autophagy"a stress response process"helps HIV to proliferate and that conversely, blocking autophagy lessens HIV production.