Seemed Starscream was placing all of his attention on her. This could be worked with easily. Especially if he wasn't giving thought to her being alone or not. She could play distraction easily if it meant giving Prowl a large opening of that back.

The baton up and the light sparking and hopefully enough to keep him from noticing if another light source appears, as she moves to block and keep his attention on her. Moving so he was facing away from the entrance. Though if Starscream proved as arrogant as normal and gave her an opening she'd take it as well.