"At least from what I read Lenscherr wasn't angling for war. But that's writing and many motives can be concealed or revealed therein." Loki himself wasn't angling for neither war nor even a debate just then. True, he had toyed with humanity's sense of shame a few centuries ago. Perhaps he'd do so again but for now... there was the memory of his mother, who had taught him about magic....
"And vanishing is an invaluable tool, as you well know. Many Asgardians don't appreciate enough the gifts my mother shared with me." That said, he created the illusion of being invisible once again.