If Four could see the sheer horror on his selves face, Four would probably get the message that Ten just felt like he saw a dead person at his own feet. Himself at that.

Ten - Ten remembers that very long fall from the satellite on Earth from keeping the rest of the universe being disintegrated when The Master's plan to take the universe hostage - backfired.

"Are you still lying on the ground?"

Why yes, Ten is going to speak to himself with his back to himself.