As Seerah said it would need to be:
Code:
#showtooltip
/use [mod:shift, talent:4/2] Charging Ox Wave; [mod:shift, talent:4/3] Leg Sweep; Paralysis
Or you could switch it around:
Code:
#showtooltip
/use [nomod:shift] Paralysis; [talent:4/2] Charging Ox Wave; [talent:4/3] Leg Sweep
Use whichever is easier for you to understand.