@Sir Rabby I'm curious but why does Stannis use this style of sword fighting as his preferred form in a duel? It would seem more fitting to utilise a sword with more reach and a smaller shield as per norm at the time.
If you noticed in my description of how the fight could've gone Fossoway had far more advantages. Stannis' style is limited whereas Fossoway's is far more flexible. The Gladius is a good stabbing weapon and in a melee most likely highly capable much like the Falchion was. However in a one on one duel the limited reach of his blade is an instant issue. Any knight who knows what he's doing is at an advantage, the long sword he's using has all the functions of a gladius and longer reach. In a duel, reach and speed are the deciding factors. Along with the terrain, but that's in most cases (and in this one) a well swept and flat floor. I know that Stannis will win this but I hope Rabby you use this duel to teach Stabby that he needs to learn to use a proper bastard sword if he wants to be on an equal footing with his opponents.
I'd also point out that Stannis should definitely never attempt to fight on horseback, he and his gladius are literally screwed at that point. There's no way that he'll ever hit his opponent unless he dived from his saddle.
Furthermore I spent some time writing out permutations of how the duel could've gone... Sorry I love sword fighting and I couldn't help it. I'm just going to share it.
1)
Fossoway vs Stabby
Fossoway powers in, one straight thrust forward onto Stabbys shield. He follows the lunge, his blade pushed up into the air. Stabby is pushed back by thrust but blade pushes forward. Fossoway's buckler slaps it away, he brings pommel down stop Stabbys head.
Stabby is sent reeling back. Fossoway follows through, buckler punches at Stabbys chest, his swords hilt bashing at Stabbys shield. Stabbys attempt to sweep at Fossoway with his gladius is to weak, he's far too distracted and hurt to really put anything into it.
Fossoway continues the offensive and slaps Stabbys shield away from his chest with his swords crossguard catching the rim of the shield. Buckler punches Stabbys helmet again.
Stabby falls, Fossoway wins.
2)
Stabby powers in, blade stabs. Fossoway steps to bring the blade on his swords side. He uses his blades flat to guide Stabbys away and belts his buckler into Stabbys helmet and sends him to the ground. Fight ends.
3) Fossoway attacks with a cut down, Stabby deflects it into the ground and stomps on the blade. Wrenches sword from Fossoway and then with a series of powerful jabs and cuts breaks Fossoway and wins.
4) Stabby steps forward and Fossoway attacks with a powerful horizontal slash. Stabby adsorbs it on his shield and then spins to wrap his sword arm around Fossoway's and then follows through to bring his shield's rim into Fossoway's face. Letting go of Fossoway's sword arm Stabby turns fully and thrusts into Fossoway's face and catches his helmet first with the sword and then with the shield. Then as Fossoway stumbles back, Stabby catches his knee and breaks his armor with the magical valyrian sword to hack into it and send Fossoway crumpling to the ground.
5) Stabby uses the tower shield to guard his lower torso and legs, his sword covers the rest of the upper portion. Fossoway attacks with a straight thrust. Stabby twists his torso and uses his swords flat to deflect it past. Stabbys dominant foot is planted forward facing Fossoway and as Fossoway moves forward Stabby puts his weight into it and raise his swords arm elbow that is now towards Fossoway. The elbow is pushed into Foosways shield and Fossoway falls back a bit. Stabby uses his momentum to spin his body around and hit Fossoway with his shield. Fossoway is pushed to the side and as he moves that way his concentration breaks and his shield lowers. Stabby then catches him from the side he's stumbling towards on the helmet. Meanwhile Stabbys shield pushes down on Fossoways weak flick up with his sword and punches it from his grasp. Stabby wins.
Anyway Danke Rabby for writing this amazing fanfic. I wish I could even be half as good as you. Sorry for being a pain about all this