Spawn Points, and Agile Work Flow

I started working on possible spawn points for the enemies. We were thinking that since the city is surrounding by water that the enemies would come on boats. At first I was thinking of large boats, but then I remembered that the enemies would have to cross land first; Smaller boats would be more appropriate.

I'll be honest that before working on these spawn points, working on tasks didn't really feel like agile work. Previous works still felt like water fall. Working on the boats finally felt like agile because I really did get to work with programmers/designers at the same time I was working.