Deciding to choose the least dangerous of the animals, you choose the rat image.
You eagerly stare at the screen to see what happens. You hear the sound of what sounds like air vents, as a yellow mist begins to fill his room until it clouds the view. You can still hear Mike screaming.
To your horror his screams change in character from fear to cries of pain. You squint your eyes trying to see what is happening, to see anything. Mercifully after a few seconds, the yellow mist begins to fear.
OH MY GOD.
The binds holding Mike to the chair have released, and now he is crumpled on the floor in visible pain. His body is disfigured. Changing. Like something out of a werewolf movie, his limbs are covered in fur. You hear the cracking of bones as his limbs change shape into something animal. His face is contorting as he cries, his very voice shifting from human to a high pitched squeal. The fur now covers his face, as his skull reshapes. Prominent buck teeth leading the way as his face cracks and pushes out painfully into a pointed muzzle.
He's also smaller. His clothes are loose on his shrinking body. You notice a worm-like thing poking out above his belt-line. It writhes angrily, as you realize it is growing out from above Mike's now-furry butt. A tail.
The transformation advances quickly, as his body shrinks, soon leaving a pile of close with only a snout sticking out. You feel your heart pounding in your chest trying to rationalize what you've seen. But there's no rationalizing this. The reality slaps you in the face when your twin brother, now a large rat, squirms its way out of its clothes.
At first the rat looks around confused, sniffing the air. Then it sees the snake. The serpent has now taken notice and his slithering towards him. You can only watch in helpless terror as you watch Mike frantically run to the corner, uselessly clawing at the panel from which the snake came in. Meanwhile the serpent closes in, surrounding him.
As the snake stalks mike, obviously intent on making him its next meal, the large white text pops up with the following options:
"CHOOSE HIS FATE"