Replying to 50 50 one ski

after watching the new brogan edit and a few other good vids ive noticed a good number of these on rails lately, some totally one footed and others with one foot and the other foot kindof slanted. Are these hard really or its just practice or is there a trick to them? And could anyone tell me how to if you know? Why is the non rail foot slanted upward? Why are all these people influencing me to try this? Why am i going to try this? Is it worth nutting many rails badly to get this trickery?