She doesn't even stop to consider that Fitz would do the same thing for her in an instant. Lincoln is risking his life because he loves Daisy and wants to save her, like Fitz has done countless times, yet Simmons calls him an idiot. Fitz's face in the background is everything.
It was so awful to hear the pain in his voice. I positively adore Fitz (he's absolutely adorable, and his innocence is perfectly childlike), and it physically pained me to hear him scream Simmons' name like that.<--- I was crying my heart out!