He hesitates at the question, suddenly very unsure about this topic.

"I'm not a chemist. I know how it's done, but not exact details about proportions." Sure, he knows enough that he could probably get it, but he's not exactly interested in experimenting with explosives.

Lance is also not sure about agreeing to explain to the Guard members, but he likes the one he knows well enough so far so perhaps it'd be okay.