You two were split up from the rest, (kieth, pidge, and hunk). And were running away from galra bounty hunters. The planet you were on had low oxygen, and you have to ditch your space armor because it was being tracked. So it was only a small amount of time before you passed out or worse. The galra eventually found you, you yelled at allura to run. Instead she used her altean camouflage and snuck up on them. You both fought them and managed to knock them out, grabbing they're blasters.