Yea, I thought the same thing as you did, julio. We simply don't know if AA went on his own or Peter Mac sent him, we don't know that. Also, AA had just singled twice in his last two at bats and didn't seem to be hampered.
Look, I am as big a critic of the manager as any on this site but in this case, I give him a pass. In baseball, managers often don't give a player the steal sign, they simply give him the "don't steal" sign. Phils were up 3-2, have been struggling to score runs and there were two outs in the 7th. Not a bad time to steal a base in my mind and thats probably what AA was thinking.
Its also worth noting that hamstrings [terribly troubling injury for a ball player] don't always signal a warning before the pull...they just suddenly pull when you running full stride. I doubt that AA will fully recover from this till off season.
This also makes putting Nava on waivers more difficult. I also wonder if they may give Alfaro some time in RF, remember they talked about this when he was first acquired.
I am not so sure that the Phils management doesn't secretly want that 1/1 draft pick. As poor as their record, they aren't that far from becoming a respectable team and 1-2 more top drafts could turn them around quickly.