[DUO Pit of Undying] <Judge of the Purge>Van Riker Will not use red tornadoes

Bug Name:

[DUO.TRI Pit of Undying] <Judge of the Purge>Van Riker Will not use red tornadoes​

Bug Description:

The monsters in the Pit of Undying will strengthen their defenses when they lower a certain hp, and they need to control him in certain actions to remove the defenses.
https://bdocodex.com/us/npc/29209/?sl=1
Van Riker needs to use the rebound skill to knock him down when he uses the red tornado.
But from yesterday’s promotion to today’s daily task overtime, I have never seen him use red tornadoes, only blue tornadoes (this is useless)
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Now it can only to Forcibly kill, And because Van Riker will strengthen the defense when it is high hp(80~90%).
(Normally, it should be 50~60% before the transition stage), so very top monster damage gear is required
(Pit of Undying only applicable monster damage, not applicable AP), the time limit is 10 minutes, It took 8 minutes for the individual to Forcibly kill it(This is only the duo level, the tri level also has it, and more hp).

this movie is very long, because Van Riker is in a state of strengthening defense for 7 minutes of the entire 8 minutes.
When approaching Van Riker, there seems to be a problem with the skill logic, only the push and shout skill will be used, It will be interrupted when using other skills. 02:13 04:58
Controllable red tornado 0:33 start

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How to reproduce/proof:

upgrade to DUO: Undying Crow's Insignia or TRI: Undying Crow's Insignia
Summon Van Riker
After inflicting certain damage to him, he strengthened his defenses, Can only be Forcibly kill, or give up.​

 

Update
Added narration and video.

 

I told that.