The informal meaning of Magnum is 'unusually great in power or size'. Magnum Tear is just that and some more.
Magnum Tear is a 2-step tear to the center where you can cleanly show the front and back of the folded paper at all times. There is absolutely nothing to see and suspect.
You can also use it to steal out the center. Magnum has this unique feature that makes opening up the folded center easy and quick even with just 2 fingers and a thumb.
Stealing someone's information without them knowing is a tool with limitless potential and being able to do it really cleanly and fairly right under the nose of the audience is a superpower in itself and with Magnum Tear you can harness the superpower too.