Here's how the fight went down.
1. swtimeline.ru/?comics=48&page=127
This is just the beginning of the fight. Now Bulq is clearly being displayed to be winning; he blocks a strike from Quinlan while only holding his saber with one hand while Quinlan Vos was putting his all into the strike using both hands to swing, and manages to pull off a force push.
2. swtimeline.ru/?comics=48&page=128
Notice on the proceeding page how Dooku orders Quinlan to kill Tholme and Khaleen, and then Bulq tells him to 'listen to [his] true master'. It's pretty clear that they're still trying to turn him back to the darkside, and because of that, Bulq was not going full out - he even states 'or I will kill you' indicating that he was holding back to try and turn him back to the darkside.
Also notice their facial expressions, the way I see it, Vos is in a rage and completely uncontrolled whereas Sora looks a lot more in control.
3. swtimeline.ru/?comics=48&page=130
Again, Bulq is being displayed as the current superior; standing over Quinlan taunting him, while Quinlan is backing down looking somewhat apprehensive.
4. swtimeline.ru/?comics=48&page=131
Here, Tholme and Aayla try to mentally reach Quinlan, and encourage him to embrace the light.
5. swtimeline.ru/?comics=48&page=132
Here, Bulq continues to dominate the fight, blasting Quinlan with lightning, and Quinlan is still uncontrolled, and in fact being somewhat mislead by the darkside within him (seeing his face in the face of Bulq, the so called "second sith"😉.
6. swtimeline.ru/?comics=48&page=133
Bulq continues to dominate - force pushes him and blasts him with lightning, however Aayla has started to reach him.
7. swtimeline.ru/?comics=48&page=134
Here is where Aayla fully gets through to him, and Quinlan fully lets go of the darkside and embraces the light.
8. swtimeline.ru/?comics=48&page=135
Having fully embraced the light, Quinlan Vos defeats Sora Bulq in a single expert move.