well ive been bursting my fire since lvl 34 up to 10x now and the 4 sequence work fine with me:) guarantee 100% work:)

Fire sequence:
1:slow down
2:poison
3:hot fire

top prior: fire combo hit/hegendis hit

i think the problem is the spd in the team. maybe somebody in the team are not being honest about their spd (its a quite a big issue =.=')

btw the poison skill ive been using always missed on the mobs XD idk why XD
the poison only work when the 1st mob been accidentally countered kill by the teammate in 1st round which automatically makes the fire attacker cast the poison to the 2nd mobs and worked(dont know how =.=')