The first one, alas doesn't solve my problem. The hologram's reaction is one thing and that's a fine solution, but the human fighters movements would also be completely different because they wouldn't be impacting on any solid objects and wouldn't be transferring the large quantities of kinetic energy they'd built up, so a spin kick would not be halted by the actual contact between foot and head as would be expected, but keep on going right THROUGH the target and out the other side.