My prediction is that the sniper is going to shoot the orc, the orc will probably drop the dog and look for the sniper, the MC will either take that chance to get out of their (though probably unsuccessful) or attack an opening.
Or that Slash and "DIE!" wasn't from the Orc, considering the fact that the orc didn't have any dialogue this chapter, so it doesn't make sense for him to be screaming "DIE" to a dog that he probably equates to a nuisance. So either a third-party or MC skill.