Toz had personally felt the might of Dristel's last attack, so he knew how much effort Dristel had put into unleashing it. Combined with how much he had expended blocking Taienra's and Toz's attacks, Dristel shouldn't have too much left. Dristel used the Dragon's Tail Sweep as a finisher to knock Toz off his feet, but it came at a cost. Dristel's body was fatigued from expending such a large amount of energy at once and shaping it into such a complex technique.
Dristel's slow walk wasn't only because he was confident in his victory. It was also a precaution in case Toz would make a last stand. Or in case someone else interfered, despite Nester's chains.