So about the trait WU push punish, it's not really worth it to waste it on that, better save the trait for parry or punishing oh teleport. The idea was from reverse WU with b2 after the meterless vortex ( without dashing under ), you can TA and 111 xx slide u3s, 111 xx iceberg u3s or 111 xx mb f3 u3s, but it's better to just b3 for 44% in the vortex ( 49% mb b3). Also it's hard to get it right, so better just empty jump or use the setups Ribbz22 mentioned. Although it works for every WU and I think it's a nice tech to master.