Zakra's Harmonic Spear of Causality allowed Izroth to exert brief control over the principle of Causality.
However, given his lack of mastery of the skill, Izroth was unable to unleash its full potential. This limited the number of ways in which he could utilize the principle of Causality. And, it applied even more so against someone of Ourami's caliber.
Nevertheless, despite the inherent limitations due to Izroth's current mastery, the principle of Causality remained incredibly versatile. It simply required one to be creative in their execution.
'If the mountain is immovable, I just have to move the earth around it.'
Izroth understood that even if he was successful in the use of Causality against Ourami, the effects would break almost instantly due to the power gap between them. Therefore, he had no choice but to utilize a more indirect approach.
Swoosh!
(Unedited)