creepy octopus

A man in a white shirt and tie stands in a dark, blue-lit environment as glowing, serpentine tendrils swirl around him; he is then shown falling backward, viewed from above, before the camera tilts up to reveal a massive, shadowy figure with glowing blue markings rising from below, and the man is seen again standing, then collapsing to the ground, his face shown in close-up as he lies on his side.