Shao Kahn's general was walking with his dagger in hand, he had no patience for others, and often times would threaten people with war. It's clear he's a very violent and stubborn individual, yet also calm.

"Stand aside."

Reiko said this with an aggressive tone, one of anger. He had no patience for you, as he had other matters to attend to. Belittling you was the last thing he wanted to do.