Notes on amal kathir: Generally, moving two hands away from their normal position is a major action and a major action nullifies the prayer. And we practically demonstrate this through various precautions during salah. When yawning in qiyam, which hand are we told to use to cover the mouth? The right. Even though the normal ruling is to use the back of the left hand. So why the right hand only in qiyam? Because if we used the left, we would have to lift both hands from their position. When a hat falls off, why are told to pick it up if we can do it with one hand but if it needs both hands, to leave it? To roll up the sleeves during salah breaks the prayer. To dress during prayer breaks salah. Why are we told to switch the mobile off with one hand? In all these examples, the reason for not using two hands is because an onlooker from afar will unlikely think you're praying if both hands are away from their normal position. Notice, the books say he is far so we have to be even more careful. Because the close onlooker might still make out you're praying. I am not saying what Shaykh Aslam demonstrated definitely breaks the prayer but I do say we should strongly avoid it as it is very doubtful. That shouldn't be the norm. Does what he did certainly break the prayer? Sunni muftis will tell us. But regardless of their answer, it certainly should be avoided.