Heroic stand
I was hosting a Geth/Condor game with the Ghost with a Talon (trying to get some Pistol medals), with the rest of the team being a Salarian Infiltrator, a Demolisher, and a Juggernaut. By Wave 4 or so, and judging by the number of bleedouts, I figured out we definitely wouldn't extract, and I was unsure if I could carry everyone with Bianca having no upgrades whatsoever (I had Pistol gear upgrade and Pistol Rail amp...because as I said, I was going totally pistol-oriented. And yes, Bianca is the name of my Saber. Real original, I know
).
That until Wave 6 (Devices) arrived. It was just disastrous. I had to switch from the Talon (which I was using exclusively up until that moment) to Bianca in order to clutch that wave, and barely managed to do it (had to disable 3 of them. By myself). After that disaster, and with not many consumables left, I figured out we wouldn't stand another wave, but...
...then something happened. After that wave, it looked like the whole team got it's cool, and in Waves 7-11 (including a nice 10-Objectives), the Demolisher put it's supply turret in the middle of the top mountanious path, and the rest of the team joined me (I was there sniping at the beginning of Wave 7) in making a kinda "last stand". It was pretty glorious, and everybody performed exceptionally well and with excellent teamwork.
We even managed a full extraction. As I said, it surprised me a lot.