Possibly if his arm is drained he relies on the curve much more. Or any hook. Appears to be lifeless arm would clearly show up nor prominently on rapid ball velocity, not something hooking. Russia introduced its offensive within the spring aiming to create a "buffer zone" inside of Ukraine https://www.dailypioneer.com/2013/india/sc-raps-ex-army-chief-vk-singh-for-contempt.html