[1. he knows you have a tragically acute inability to lie. 2. you just listed one measurement, like a five-year-old, with nothing else to confuse or distract him.

He leans in, so his voice comes from a spot closer than comfortable, close to Ignis’ face. It might be?]

I think it is.

[Be more difficult, Ignis. Let him demonstrate.]

Isn't that a close enough margin? if I'm to guess any more, I'll have to start touching you to mark out the spots.