I suppose you don't usually feel your own flames, then.

[ Tris takes her glasses off, and stares at Rin a bit. The faint silver sheen to the girl looks worse than usual, and as she concentrates, that internal glow that she'd focused on before looks... a bit pathetic at the moment. ]

The way your magic looks is just plain different, so I don't know if anything I am about to say will make sense to you. When you draw on your fire, you let some of it out, right? Instead of drawing on the fire inside you, I want you to try to draw on the fire under your hand. It might feel like a coil.