Remus' wolf rose up as the more powerful spell struck him, but even though he could feel the push behind it, sense Sirius' firm intent, the wolf refused to back down.
Still, the internal struggle left Remus panting, sweat dotting his forehead, and he had to breathe deeply for a few moments before he could speak.
"Better... but not quite there," he said finally, offering Sirius a good natured grin. "And I didn't say you couldn't give orders, Padfoot, I just haven't ever thought that you particularly like doing it." He swiped at his forehead with the back of his hand. "More practice, I think... but you might be almost there for Faelan's wolf."