I think yes , you have legal problems .
IMO , the guy technically didn't threaten you and you had the option of leaving him in your dust .
1) asking me if i "want some of this" with a tire iron in your hand is a threat where i come from.
2) trying to flee isnt required.
just playin devil's advocate. as another poster noted, i think it would be different (ie more threatening) if i was boxed in/stuck in traffic/etc.