Or he thinks she's bluffing...
Noticed this shot of Vickers, observing the collision above her (reflected in her helmet)
It appears to me that Vickers is suiting up and getting the flamethrower before the team return. So, she was ready to roast them before she could see for herself with her own eyes, what shape they were in. This scene has to play out in conjunction with Fifield going beserk, probably after witnessing Vickers 'solution' to their predicament - it would just be weird to have two different scenes depicting the same kind of fight in the hanger area.
Knew it was a question of minutes before Cvalda would make dat