I won't make it, is Jane's first thought as she explodes into the abandoned warehouse only to see a gun pointed at Maura. Time seems to slow and her eyes rake over Maura's frozen figure first, but the feeling of relief that the doctor isn't injured is fleeting at best. She moves her head to focus on the threat instead. It's there, in the set of his jaw and the strength of his arm that he's going to shoot. He's going to shoot her. And Jane isn't close enough to tackle either of them to the ground.
She dives in front of Maura just as the gunman squeezes the trigger, arms wide open to take the bullet, but her eyes close. She doesn't want to see it happen; she just wants to get it over with. Except there's no tell-tale sound of gunpowder exploding in the chamber, there's no acrid after-smell, there's just... nothing. She hits the cement floor hard on her side, jarring her shoulder, and gets the wind knocked out of her. Her head snaps against the ground; there'll be a very decently-sized goose egg there in the coming days.
Instead, Jane hears a thunk and opens her eyes to see Frost on top of their perp, both of them crashing to the floor.
The sound of the two men going down snaps Maura out of her frightened trance. She darts to Jane's side. Automatically, her brain is making her ask Jane questions about any injuries, making her compartmentalize to allow herself to breathe. All that's passing through Maura's mind is: Jane, you almost died.
Jane rolls onto her back to get a good look at the medical examiner who hasn't stopped rambling medical nonsense at her since she knelt down beside her. Their gazes lock and even though she knows that Maura's in the midst of removing her emotions from the scenario, she can see the ghosts of tears and the look in her eye that says You would have literally just died for me. And she knows that her own eyes are conveying the only truthful response she has: I'd do it again, too.
Meanwhile, Frost has the guy in cuffs and is leading him out to the just-arrived back up. He hands him over to an officer, charging him with bringing the suspect back to headquarters, and then he marches back inside to check on Jane. He honestly doesn't know what he was expecting Jane to do when they arrived, but diving in front of a gun to take a bullet meant for Maura is definitely not on that list. Although, he ponders offhandedly, knowing those two the way I do, it probably should have been.
He strolls over to the gun lying almost-forgotten on the ground and picks it up. He checks the chamber and the clip, letting out a hearty chuckle which captures the attention of Jane and Maura.
"What's so funny Frost?" Jane asks, attempting to sit up despite Maura's hands pushing her shoulders down.
"Dude ran out of bullets."