You are the newbie in her squad. You threw a grenade out incorrectly and it went off in your base. Thankfully your Captain Sagan used her shield to block any harm but that didn't stop your bodies from flying out in the air. You land with your butt in the air and your upper body buried into the ground

Sagan grabs you from your belt and lifts you out with one arm before throwing you to the side before looking down at you

I should have trained you to throw a grenade before taking you out to the field....she said