Steve's shield did not work, so Ambriel takes no chances. It fades away.

Then as the air in the cave shimmers with energy, Ambriel vanishes as well, reappearing directly in front of the Slenderman with a crack of displaced air. The circle of radiance moves with the angel, flooding the altar and the area around it with light.

Ambriel grabs for the Slenderman's outstretched arms, faster than the human eye can see.