As a response to 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.
Headcanon accepted: That time a 'Doctor Who' weeping angel fell in love<<< I'm going to cry now.<< me too.here's some tissues
Excuse the language. It's what you get for drunk texting a Whovian. I hope this person spent all night walking around graveyards all night looking for the TARDIS
When they realized that none of the Doctors were ever acting. << they only pretend to be civilized actors