As the blindfolded, horned xenos demanded order, Stern was just preparing to charge his assailant. Such a demanded was even more an affront to his honor, even though she clearly never had seen a space marine before, and didn't understand. Regardless, something was bothering Stern with the whole scenario. It wouldn't hurt to pause and think his situation over. Stern decided to remain on guard, watching the dog xenos, while thinking his situation over.
The, out of nowhere, another blue xenos, this one with a weird array of spikes on its back, went into some sort of speech about how he was wrong to try to fight the dog xenos. Clearly, the fool had never heard of the imperial creed. Then, as if to speak even more volumes to the thing's idiocy, it asked if they all could be friends. This time, Stern could not restrain himself, as he mockingly laughed at the xenos. "Friends!?" he said. "Are you some kind of fool, xenos? Your very existence is an affront to the imperial creed of mankind! I'd sooner be a friend to heretics and renegades!" Stern took a pause, then continued. "However, in light of our circumstances, I will restrain myself for the moment. But I will not lower my weapon."
A few things came to mind. First of all, none of the humans seemed to recognize him. True, the Grey Knights were a secret chapter of the space marines, but space marines themselves were fairly hard to miss. They were a part of all human history and culture, and yet he went unrecognized. The second thing that was off-putting was that the xenos clearly didn't recognize him either. This could be explained by the fact that they had never encountered the imperium before. But then how did they know low gothic? That was a question he could answer right now. He turned to the horned xenos and asked such a question. "Xenos, you clearly have never encountered the imperium of man before. If that is the case, how do you speak low gothic, the common language of humankind?"