Kat might have physically recovered from her last ordeal, but the mental wounds hadn't even began to scar yet. Marlene was her crutch, a comfort leg to lean on, even if she didn't know it. 

This was to be an easy reintroduction into the field, out of main line of fire, not to mention in camo, positioned purely for support and back up, and the opposition were merely rookies. 

 All the more reason Kat lost her shit when 'B' took a sudden and unexpected round right to the face.
They shouldn't have been located here!
The screeching of the metal, the bright flash of sparks and thunder of return fire. It was just too much.

Cecilia's command was but white noise lost to the back of Kat's mind as she watched Marlene's old Handou, her support line, disappear.
The flashing bleeping of her cracked screen finally caught her attention, 'a runner' Cecilia's words emerged from the back of her mind. 

Kat takes a short sharp breath and tries her hardest to feign the old excitement she felt in situations like this. "Ok baby lets line buster up." 
Her words were forced and full of uncertain fear. Her hand nervously hovered over her ECM switch, ready to shut down the enemies communication channel prior to firing a devastating 106mm HEAT warhead at the deserter.

Timing was right, the enemy was on target, reaching the spot, at location, moving on, passing by, escaping freely. Kat's hand trembled more then she knew possible. Her gut was twisting in knots as her lungs frantically pulled in erratic short sharp breaths. Everything spun snd her world became a blur.
...[i] don't give away your position  [/i]...

She ducked and spun Snow Leopard around, sliding her back to the wall and falling hard to the ground. Quickly Kat powered her down, bypassing all correct safe operating procedures. It was only when the glow of the cockpit faded out did her breaths begin to normalise.

She looks at her hands still shaking, she could feel the tears trickling into the fresh lined skin of the white scars on her face as they made their way from her eyes to her chin.

The panic of her anxiety attack slowly gave way to realisation and ration, Kat was suddenly swept up in a whirlwind of furious hatred and self loathing for her failings. She let the team down... Again.

She screams! Not a scream of words, just a primal scream. She screams and screams until her lungs give up and her throat is aching sore, her hands ache and bleed from beating on the control board. 
She screams until she can scream no more.

She tries to start the Snow Leopard back up. She can't.
Her body goes limp and she slumps into her seat, eyes glazed and empty she stares at nothing while trying to ignore the sounds of combat around her and the images in her head of everyone slowly dying, one at a time, because of her failings...