"though" and "although" usage

I'm proofreading a script for a visual novel, and the writer of this script uses "though" and "although" very often as linking words at the start of sentences. For example:

John: He was assigned the task of taking care of me.
John: Though, he wasn't very pleased to hear it.

or:

Tim: He said that he aced the exam.
Tim: Although, I sensed a bit of tension in his voice.

I know that technically it isn't grammatically correct, and I don't really agree entirely with it, but I've been turning a blind eye to it for a while now. I figured it might be an acceptable liberty to take for a script, similar to, say, starting a sentence with a conjunction.

Either way, I just wanted to get some more opinions on this. Is it an eyesore seeing "though" used like that?