If Cold wasn't already pissed at him, and if Mark himself wasn't so eager to leave, he would've made a comment about Len being able to grab the lady's number. Instead, he just smirked and snorted at him, while pushing the money toward Harley.
"Thanks Harley, but don't worry about it," he gave another forced small smile and a wink, not wanting her to get the wrong message and become upset again, "If the winds of fate blow right, we might run into each other again."
Though it would take a lot of convincing to come back to this city. She didn't need to know that, though. Mark's biggest concern besides leaving Gotham, was how Len was going to fare without a huge breakfast. And even then, it was a ghost of a concern.