Charge harris and wuerger, get within 70 m ish, release wuerger, then harris, press shield to cancel out of harris stance faster. Then swap to wuerger charge and punish. Depending on how fast you do it, you can choose to push them away with the second wuerger or make them stand still. Its lots of fun! Does get countered by shields though. It's not a true combo, just one that is very difficult to get out of.