[@Shoryu Magami]

 Well, I'm not going to lie. That post from yesterday was not my best work. Quite frankly I was writing it while trying to stay away. By the time six o'clock rolled around I was pretty much dead. So I may edit the post. I would ask that you take the time to double check just in case. 

 On any accord, the positive or negative modifiers come from my character sheet, the given situation, or other guidelines set out through my experience with Dungeon and Dragons. So for example, when Maddox makes an attempt to phsyically attack with his sword the roll is determined by 1D20 + his strength modifier +4 (which is a result of his strength attribute being 18 + his base attack bonus +1 (which is typical for a level 1 character), and +1 for a feat known as exotic weapon focus. This totals out to a +6 on his attack rolls when fighting with his bastard sword. This same idea applies with a number of situations. With various modifiers both negative and positive. 

 As for the duration of your spells, in Dungeon and Dragons (I use this because it provides the best example for me personally as opposed to video games) they use the duration for most buffer spells as 1 minute per level. Given that this is suppose to be a level 1 fight, I would suggest that 60 or ten rounds seconds would be a sufficient time. So every round of posts (you post, I post) constitutes six seconds. This of course would be acceptable for subsequent castings; however, I would surmise that the first spell you have caste (the endurance spell, if I remember correctly) would most likely be down to the last 30 seconds if not less considering it was caste before the altercation began and the time it took to reach the actual altercation. 

 I believe that has covered all your concerns. 

Edit: I have altered my post slightly. It does not change anything about the battle it is all merely aesthetic changes. But it is sufficient as is.