It should be pointed out that not only do the Ducks have the legs of chickens (I noticed that playing the first time) but Fubar, a Griffin, has the tail of a horse, not a lion.
Anyway, as for Luc's line, I think he has to be in one of the spots on the left buddy group for him to say it. I think its something along the lines of "Luc, I'll never forget the times we spent fighting side by side" or something like that. As for a tear jerker, I don't think so. I was a bit disappointed that no one, such as Apple, made reference to Luc's sudden desire to destroy the Grasslands.
"It doesn't matter if the glass is half empty or half full...what matters is the glass."