Positioning & Pre-Buff:
A/D + RMB >> SHIFT + W >> W + F >> W + RMB
Then the usual DPS combo:
SPACE >> SHIFT + F >> SHIFT + Q > Q >>
Reposition with W + C (to the back of the pack)
>> SHIFT + LMB >> SHIFT + RMB > RMB >> S + F
Example of the combo execution here: