This is wonderful. I like that Elizabeth gets to be brave and clever, but also getting to be put in a situation where she has to hold her nerve and out-bluff a foe who's not stupid. She's not reckless, but she is proactive.

And I love the Mozzie-El dynamic, with the codes. That line about her being the only one who does it, and about Neal doing it but being sarcastic, is golden.