[Help] What episode of EC is this from?

Railguns

Was the one they talked about firefall? I came in at the tail of of the epuisode being played on twitch tv for firefall octoberfest or what ever they called it and I thought it was great to see EC being spread around, I couldn't place what episode it was and browsing all the seasons couldn't figure out which season it was from even.

Thanks.