this is actually bob's first accident, by working so close to the antichamber's reactor core (he was investigating a mysterious disturbance coming from the floor near the core) that once the reactor's destabilized and blew up on him, the initial blast radius and shockwave was so powerful that it made him evaporated instantly but at the same time recreating his structure from the ground up but in the same shape and form which basically made his physical attribute has the ability to phase shift and thus, made him invincible and immortal, 2222x2222, 2017