They are a different race and class, and you've never met them before. They're headed straight for a very difficult dungeon, and you're not doing anything particularly important. This guardian also has a microphone and speaks your language.
What do you do?
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Well, I would be with my clan/group. I'd have us all wait to see what is going on if he/she enters alone we will go in after. When he/she turns to run away we would block the way, we'd wait for him/her to ask for help. But if he/she fired at us we'd kill him/her loot the glowing ball and leave. (or finish the dungeon)