Appears to me like it's going into "re-veg." Did your friend mess up the light schedule? I have re-veged quite a few plants and this is what they look like once they bounce back from being on 12/12. Just a thought, switch them back to 24/0 or 16/8 and wait for the leaves to go back to normal. (5/7 fingers instead of 1/3) You will lose all the bud that has developed on the plant, it will die off. But then you could try to re-flower it and see how it turns out.
P.s. Before the bud on the plant dies off, you can pluck it, dry it, and enjoy while you wait for them to re-veg.