Salvador.....hmmm.....well I would have to say that he is probably one of the more honorable people in the land. He is extremely loyal and so crossing his trust is definitely something I don't think he soon forgets....Octafino knows a bit too well. However, even with that said, I would have to say that he does act with more restraint than I think most give him credit (he could really be much more terrifying and awful)...scary thing is, I think he is as Narissa said, honing it down before he really unleashes it all.
I certainly dread the day that Salvador goes after us all, though hopefully by then Octafino will have learned how to eat some blackroot, move around, sing a few songs and do a few dramatics all while fending off a spam of attacks.
As far as RL sal, well, all I can say is Sam in a Harry Potter scarf is not how I pictured the terror Salvador can be.