Ops, I didn?t know that. I was using +20 to the attacker and the loss of shield bonus to the defender. Where the +35 is on the Core rules?
HARP core rulebook, page 85, bottom of the left hand column.
An attack against a foe's flanks gives +15, and attack against foe's rear gives +20. These bonuses ARE stackable, just as in RM. Thus, attacking from the rear is basically the same as saying rear/flank, and thus the bonuses are added to give a +35 to the attacker.
One of the premises of the Shield Training talent is that you can AND do move your shield around. This means you get your shield bonus against
all except surprise attacks (which is going to be the only way to attack somebody from the rear as they can freely make one facing change, making that rear attack into a flank attack IF they know it is coming).
Now, if the target does NOT have Shield Training, then I would limit the DB bonus to ONLY the front and the flank on which the shield resides.