The blue light shined upon Mark just as it had on Jeff before, who was now a military riffle.
The changes started at his feet which grew considerably longer. His toes merged into three and his nails grew thicker and longer into black claws. Beige fur started to grow on them and spread upwards his legs over his knees and to his thighs. As the fur reached his groin his bum inflated in size. His member started to be connected to his belly via a sheath of furred skin. His spine grew downwards, forming a a thick fleshy, yet obviously furred, tail. As the changes spread further upwards they reached his arms and hands, giving them fur as well. His fingers changed a bit, giving them black pads and changing this fingernails into pointy claws. When the changes reached his head, pushing his jaw and nose forward, making them longer and creating a black nose tip. Then his ears started to grow and became pointy and lightly furred. Looking down at himself we looked just like a kangaroo, perhaps a bit larger and with opposing thumbs, but otherwise normal.
Then the second stage of the changes started. He felt a strong pressure in his chest. If he hadn't been in such a good physical shape, he might have thought it to be a heart problem. Then his back split open, with a metallic structure pushing out of it. At first it was fairly devoid of any shape or form, but then it refined into a helicopter rotor with a pair of long flexible blades. A similar rotor grew on the side of his tail.
As he noticed that he was nude he sent an order to his internal computer which made a holographic image of his uniform flicker into place around him. He wondered if he was functional and bent over. With low power he started his internal engine making his rotors spin, first slowly, but then at speed. Eventually they reached their speed and he started to hover over the ground. Satisfied with his performance he landed again and stopped his engine.