No he doesn't have to roll. Also you are only allowed to push a roll if additional successes will increase the effect of the roll in some way.If the attack is a miss would the defender still have to roll for the dodge or parry or would they just lose the action? Would there be a benefit in rolling aside from the option to push the roll?
Combat goes like this:Do you declare if you are dropping to the ground or staying on your feet for a dodge at the roll, or at the dodge declaration?