Offline, with practice you can get the F3xxBD3 quite consistently. You need to run as soon as the end of the X-Ray animation allows you to do it. And don't run too close to the enemy, you ahould run only until you are in F3 range.
But online I recommend you to stay safe and do a shadowkick which will land 99% of the times.
You can try the F3xxBD3, but if you fail you are probably eating a full punish on wakeup.