Samuel (or Felix? I'm still confused about that XD) was also a good shot. However, a combination of Diego's speed and the shrubs surrounding his heel made the arrow miss it's target.

As he continued to run into the woods, Diego became absorbed with the bag of money. When he stopped to take breaks, he would just blankly stare at the bag full of gold. He became obsessed with the little pouch. One could say that this was a good thing for Diego, because it seemed like he finally cared about something over himself. However, Diego only cared about the gold because it would benefit him. 

There was no arguing that the gold had done something to Diego. It made him want more. He needed something. Something was missing. Maybe the gold could help him get that. But that thirst for an improved life made Diego an opponent for all who stood in the way of that goal. Although Diego may not be as powerful of an opponent as Artholath or Lance or Ixi, the gold had made him become the most evil, at least temporarily.

Artholath was a demon. He basically had no choice but to act evil. Lance and Zeke clearly weren't the good guys either, but they were both more human than Diego. At least the two of them could love, even if it was their own creations. Diego, however, only loved himself.
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As the ostrich monster approached La and Lo, he didn't seem to recognize a difference between the two, but Lo/La seemed familiar and like they had food. The specimen prodded the rabbit creature's pockets with it's beak.