[Cardinal used the time to disappear; they're no-where in sight when Emet-Selch takes up his station. Things are quiet, no sign of movement.

Then the breeze picks up, swaying the trees in the distance.

And above Emet-Selch: a soft whoosh of displaced air. Aiming the warpstrike so that it doesn't harm Emet-Selch means Cardinal has to appear a fair height above him, high enough that it gives them a few seconds of freefall for Emet-Selch to notice.]