I noticed that the left right arm for the east walking animation (red), is the same as the one for the north-east walking animation (purple).
In addition, the south walking left arm (black) is different: the east right arm (red) -in theory- should be like this, just mirrored (not exactly, the order of the sprites is different, but you get the idea).
I'm making a new alien based on the muton sprite, and I'd like to understand if I should fix it, by placing the correct arm in the red row, or leave it like this.
Does the muton's drawing routine take this into account?