Braid - Climb up the ladder on your left. The key should stay on the platform above, as long as you don't go too far left. Stand on the platform, near the left side of the ladder (closer than my picture shows.) Stand for a bit to make a good rewind point. Go down and kill the enemy wandering on the ground, then quickly rewind to this spot.

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Climb up the ladder on your left. The key should stay on the platform above, as long as you don't go too far left. Stand on the platform, near the left side of the ladder (closer than my picture shows.) Stand for a bit to make a good rewind point. Go down and kill the enemy wandering on the ground, then quickly rewind to this spot.