This was an exchange Slav with Nf3 Nf6 Nc3 Ne4!? This is a suspect move this early, the typical idea is for Black to play e6 and Bb4 pinning the Knight and then play Ne4 looking to double attack the piece while pinned. Having been and exchange Slav Qc2 is a nice reply and the Queen already has an open file to sit on while defending the c3 Knight and attacking the e4 Knight. It’s possible this is a pet line of my opponents and might work in a blitz game to catch someone off guard but in a longer game where time isn’t such a factor it can be exploited. The game hit some fireworks on move 7 where Nxd5 is played where if the Queen captures the Queen is free to take the Bishop on c8 with check (that’s what happens).