I think you would be surprised how much I'd believe.

[ Istredd smiles faintly but he is no stranger to being uncertain if something is real or not. He remembers back when he first was found as a child mage, or over the years as his life unfurled in unexpected ways. Blue eyes note the fingers on his torso and he was told a few details of what was possible here. Maybe the young man didn't know he could ask. ]

Have you heard of the multiverse? The idea that there are infinite universes all existing at the same time.

[ For his world, they were Spheres, and they were disconnected from each other, although once upon a time they were not. Istredd has a very patient and clear voice, as if he's taught before or he is used to explaining ideas to other people. As a historian and researcher, he has, many times.

Istredd lifts a hand and before him an illusion begins. It doesn't occur to him that it might seem strange to someone, to suddenly use magic this naturally. He creates two globes, meant to be planets, and then a line that ran parallel between them separately.]

You may be in a hospital bed here in your world.

[ He points at a glowing spot there, and then makes a line of gold from the second planet directly into it. ]

But the spell used to bring us here plucked you out of that moment and brought you here to this one.

[ The gold light comes to the second planet and then turns the entire globe glowing. ]

Whatever happens to you in your timeline after this is unknown, but this is happening right now.