Mark went from bemused to realizing he would pay for this later the moment Len opened up his arms. He was never rarely warm, except maybe when Lisa was around. And Harley sure as hell wasn't Lisa.
It did seem to get some attention off of them.
"I'm not sure we have the time for milkshakes, Harley," thunder started to rumble outside, "Sounds like there's a storm on the way. We should probably try to not get caught up in it."
Mark didn't care to wait around for some of Gotham's "finer inhabitants" to show up, be it Joker or Riddler. If they showed up, the Bat might show up, and Mark wasn't quite in the mood for a fight.