Tatara seems oddly melancholic to Inigo (and it's something he brought up to Yata, only to have Yata freak out, so he switched topics) which he ... understands to a certain degree. Inigo had to smile on the battlefield in order to prove his worthiness and show people he could be relied on. So in many ways, he gets that smiling away your situation is for others. On the other hand, it bothers him to see it happening to someone else and he will definitely lend a helping hand whenever he can.

Reverse!