This is way over my head, but IIUC practically this would be both an arm CPU and an x86 CPU at the same time? Can it switch "on the fly" in a practical manner,

This is way over my head, but IIUC practically this would be both an arm CPU and an x86 CPU at the same time? Can it switch "on the fly" in a practical manner, and if so what kind of context switch are we talking about? Would it be viable to multitask between the two archs?