I didn't realize it at first, but I'm not receiving any Bark Modules from defeating the Roarmulus Twins.

After defeating them, I checked with Brinks to see how many more tokens I needed and did it again. When I went to Brinks, I realized my token count remained unchanged. I looked through my game log, and found that Bark Modules were never given.

I do not recall whether or not the giant yellow flash animation played.

Notes: I was doing the Mission "Built to Destroy!", and did it on both Normal and Advanced difficulties.

Am I supposed to wait at the site where the token drops until the tokens are given?

RESOLVED: You apparently do need to wait until the animation triggers.