Ignis takes in the brief explanation of the spell - or at least how it functions. It's good information to have, knowing what will make a spell last longer or be less of a bother, both as someone who is hoping to figure out spells for himself and for the more immediate matter at hand.

"Thank you. Then, shall we go, since you have no pressing matters at hand?" It may be a little tricky since it is daylight still, so not the best time for viewing small lights, but it will be a good time to at least see where they are going and what they are doing.