[quote=@XxFellsingxX]
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Hmmm... maybe a police officer that was, at one point, giving the crew grief?
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I can totally see her going after a cop that's made it a habit of abusing the badge. Especially if the cop has made it a point to harass the crew.

She would go for the softer touch at first. Loch probably witnessed her bargaining with something clearly invisible. At least to Loch. But from overhearing Cassidy's side of the conversation you would have gathered that she struck some sort of a deal with this invisible something to go haunt Officer Jerk. In exchange for dealing with unfinished business the ghost might have had.

And when that didn't work and there was some sort of a confrontation between the group and Officer Jerk, you would have witnessed a brutal beatdown in which everything that could have gone wrong situationally for the cop, went wrong. As if Cassidy was directing the circumstances to conspire against Officer Jerk and favor her. In fact someone from the crew might have had to intervene before she killed the poor shmuck.