Couple questions about rerolls
1) As stated by the rules, the "re-roll" ability may be only applied to the player using it. http://boardgamegeek.com/thread/1043001/players-reroll-abilities 

2) When you re-roll the dice you completely ignore any previous beneficial results from the re-rolled die. But you may use these 2 tokens received from the "success" die to re-roll the "wound" or "card" die. http://boardgamegeek.com/thread/1098036/do-you-get-keep-determination-tokens-if-you-reroll