When cutting for this, just keep running and trust that the thrower has done the right thing. A rookie mistake is to stop running if you lose sight of the disc; don't. There is a period of time when you won't be able to see it. Keep running, keep looking, and the disc *should* reappear! Keep your eye on the disc once you've spotted it.
That said, be prepared to adjust your cut to make the catch easy - as you would with any leading throw.