[SamuraiScot]

He said he hadn’t spoken to the women when he picked them up near Lexington Avenue and East 66th Street in Midtown.

Looking at the video, my guess is that at some point after the pickup, he made a remark about their relatively scanty attire, which the gal sensed was the intro to trying to "take advantage" of them.

I say this because when she lurches forward with the mace, she is clearly furious.

[Jamestown1630]

If that were true, why would her friend be so shocked at her behavior?