I know there are a number of different endings. I just finished playing the first time through and I'm not sure I understand. Upon leaving the final location, Tex is arrested for the murder of Slade and Mantus. Okay. Next thing I see is pseudo- old west showdown with Dalton(?) and Tex walks away. WTH? Did I get 2 endings or is this a glitch or what? Thanks.
No it was right. Your ending had 2 parts. I asked Adrian Carr and he said Tex makes bail and then goes looking for Dalton to get his revenge on that path.

Once you start down the dark path, forever will it dominate your destiny.
Okay. Thanks Sam