[He'd be a little more surprised at someone just...being a blur but he's (sort of?) friends with an Elf who can turn invisible.]

Uh, saving people?

[Like literally being a night in shining armor, bro.]

The weird people who took me to the-the really big castle [He's not actually sure what it is, but Diadem cannot register in his head as anything other than a castle; it's so huge] told me they need heroes, and until I can get back home where I belong, I agreed to be a...whatever they call guards that can do shiny sparkly magic things.

Since apparently, I can do that now.

[He isn't sure how he feels about it yet. He's so used to being around dark magic that he can't help but worry that it has a price, that it's not like the good kinds of magic that come from being in tune with a primal source.]

I was trying to save the shrunken people in those mirror prisons, that are being sold as slaves - [He shouts in the direction of the flustered store manager] Which is even more twisted than just imprisoning them, by the way!

[He turns back to Tommy.]

I was just trying to pry their prisons open to get them out.

Aka saving them aka my job.