In the tutorial called "Lifting and Throwing," the game will demonstrate how to lift and throw using a powerful Snakish sword. This sword never appears elsewhere in the game, and has techniques you can only learn from that sword. You also only have this one chance to grab it.

To get the sword for your own, confine the Bottle Mail character to the sword instead of lifting it like the demo told you to. Let his three Remove turns run out and the sword is yours.