As a response to 7, 10 was holding it in so he could see all his companions again as himself and could do no longer when he reached the TARDIS. The build up of energy made it explode out of him whereas with 9 he just let it happen.
Thumbprint Christmas card And the angel said to them, “Fear not, for behold, I bring you good news of great joy that will be for all the people. Luke 2:10 For unto you is born this day in the city of David a Savior, who is Christ the Lord. Luke 2:11