She was a breath from saying sorry, but. [i]I'm sorry, Barry, but I have full confidence the team can survive without me for a little bit.[/i] Or her initial thought out response, [i]I'm sorry, Barry, I adore you...but I wouldn't expect you to understand.[/i] How could he? Lose your world, and make a team building exercise a more important priority than getting to the bottom of the death of your last known relative. The little baby you promised it's crying mother and stoic father you'd protect. 

Then something weird happened. Lois Lane's voice entered her head; at first a distant sound that rose in the back of her mind like a sun giving dawn's clarity to an otherwise dark and disturbing place. [i]The problem isn't your disconnect with humanity, Kara. It's that humanity will always look at you and expect what Superman would do.[/i] The thought was enough to make her want to hiss at it. It chaffed her logic fueled alien sensibilities. Emotions were something Kryptonian scientists were taught to moderate, to be wary of. 

All those thoughts right before she let Barry down, and then he just...did something bad? "Sanc! What's happening?" 

The A.I. spoke with Alice's voice. "If measurements are correct--"

Barry's eyes snapping open and conscious cut the A.I. off, and Kara was left with no more than a sigh. It wasn't anger, but it was most certainly irritation. [i]There goes letting him down.[/i] She didn't need Sanc's feed to feel and hear the chaos. That was the curse of being Supergirl, she guessed. Sarcasm came sharper than shards of broken glass, with a tone just as jagged to match. "Yeah, Barry, I'm kinda super-aware. I also have objectives bigger than this team. You ought to know that, by now, especially when I think I found the person who killed Kal-El."

Kal-El's death and Kandor. There were no more important things in Kara's existence. He knew that. At least she thought he had known it. When the door opened to the floor she had taken as mostly her own, she didn't look back at him, only kept her blue eyes steeled straight ahead. Her jaw still set in anger, even if she'd only allowed sarcasm and irritation to show. If she looked at him now? Emotional control. Best to just look ahead. 

"Go on. I'll meet the team in the field." 

Even to the fastest man alive she was gone. Just like that. A quick change en route, a message to Grayson, and she was out of the door and off the balcony in micro-seconds. It took her about the same amount of time to come across a San Francisco trolley car that had...redesigned itself into a beastial form complete with four legs and two mandibles alive with a pale blue light of an intense electrical field. Kara was just in time to get the pinch from the mandibles, instead of the trolley driver turned electro-beast's first target. People went from screaming to gasping the moment she appeared caught between the mandibles.

Some started filming, or trying to, if their phones worked still, and saying that name what seemed to her like every other heartbeat.

[i]Superman. Superman. Superman.[/i]

The mandibles ripped clean as anger drove her aggression into violence. "We need to disrupt the electron orbital motions and electron spins, Sanctuary. I probably can't beat each of these...things...down to dust in time to save everyone. We need a bigger, better, solution. S--" Words cut off from the remaining weight of the trolley beast ramming into her body with an amazing surge of kinetic force propelled by electricity. Her body went end over end in the air until it shuddered into the pavement. The thing tried giving her the kind of electrical charge that would fry most, but she just slowly got to her feet and stared with cold blue eyes as electrical forces illuminated the air around her and blackened the pavement in which she stood in the middle of the San Fran street. 

It tickled. In response, she used heat vision and her bare hands to rip the thing to shreds. Literal, actual, shreds. It only took a few seconds, before she superheated the shreds to literal nothingness. Then she looked up with red glowing eyes, and yet none of the fools that stayed to watch seemed all that frightened of her. "...quite the reputation I've got on my chest, Kal." 

A brief wave to the camera, and Supergirl was in the air, looking for more.