The sentry's only movement is to turn his head slightly as he follows the light's movement, completely mesmerized. Nothing but beautiful colors in his eyes, and in his mind. His only response to the poke is to blink once, and with the slight pressure to his forehead his head tilts back a fraction and doesn't correct itself. His ears twitch slightly at the sound of Light's voice, indicating that he can at least hear something, but there's no reply.