Yes, you did really well to get this into 100 words! I really like this:

“And I meant it,” he says with complete conviction. Suddenly she hears the sound of the TARDIS materializing and glances at the view screen. She smiles as the door opens.

It's obvious that he meant to save Jack all along, and that's my personal canon, so I love to see authors agreeing with me ;)

Thank you for writing this! :)