It was easy to accept the abnormal when one's best friend was destined to be the greatest sorcerer of all time and his mentor was quite advanced in "science". Lancelot experienced more strange things in those small rooms than he experienced anywhere else in his life - and that was saying something as he lived all his life in Albion. Technology was didn't stand up against spirits that froze you inside and out - or all the explosions Merlin made. If it wasn't attempting to kill him, Lancelot was good. It helped that Lancelot was the 'watch and listen' sort. Why attempt to disprove something that not only his eyes could see but Elena acted was a normal part of her life? Her life being the key words. This life was so obviously not his own, what he was used to. Some of it may be too much to believe but it was happening.
"You are quite welcome." He stated, as he continued to look around. "I'll - " Lancelot stopped himself. He was about to say that he would have to tell Galinda herself but he stopped himself. For a moment he thought he saw something on Elena's face; but he couldn't be certain. He didn't know her well enough but he did have enough manners to keep his mouth shut. "have to be careful not to damage to her handiwork." Like not by sitting on the lovely furniture with his dirty armor.
When Elena gestured that he sit, he stated, "I'm fine, my lady." The title slipping out of habit - and likely in part because of Elena herself. "I would not like to ruin your friend's work. My armor is very dirty." And chances were it would catch on the material of the large chair.
"Lucifer ... from the Christianity of the Romans?" He was vaguely knowledgable about these things - just barely remembering what an angel was. "A magical seal is my reason for being here." It was much more of a statement than a question, to show that he was indeed following her. "Is there a reason for this?" He asked, pensively. "My apologies. Please continue." He stopped himself from asking more. She likely was going to get to that.