Vanish is being used weirdly, at 3.4 seconds into the fight for both talents' APL, wasting mantle window.
Howto:
Here is the line to fix it
actions.stealth+=/vanish,if=variable.ambush_condition&mantle_duration=0|(equipped.mantle_of_the_master_assassin&mantle_duration=0&!variable.rtb_reroll&!variable.ss_useable)
Description:
Howto: