SS: Scervo Strategy Explanation

Walk State: When he walks.
Stun State: When he is stunned by your attack.
Attack State: When he attacks.

Walk State:
- He blocks your attack with RNG.
 Direction, Normal Slash or Spin Attack are unrelated.
- He is stunned by Spin Attack once or Normal Slash (Stab) three times.
 So blocking is RNG but Spin Attack is still better in this state.
 UP-to-Down Spin Attack does double hit if you are close so it's probably better.

Stun State:
- He still tries to block some directions but Stab ignores it.
 Actually, you can use Upper Slash as well but Stab is faster for next movement.
- Back to Walk State after knock back twice or time passes.

Attack State:
- He randomly chooses 2 or 4 kinds of attacks. (2 in first phase, 4 in second and third phases.)
- Goes to Stun State by Shield Bush or interrupting Charge Attack.

He has 8 kinds of attacks in total. Single or Double, Direct or Charge, Sword or Arm.
A: Single/Direct/Sword
B: Single/Charge/Sword
C: Double/Direct/Sword
D: Double/Charge/Sword
E: Single/Direct/Arm
F: Single/Charge/Arm
G: Double/Direct/Arm
H: Double/Charge/Arm

1st phase uses A or B, 2nd phase uses A-D, 3rd phase uses E-H.

Sword or Arm:
 It's just different animation in 3rd phase but Arm Attack has knock back effect.
 So you should take damage in 1st or 2nd phase, not in 3rd phase. (Optimally, you should take damage in this fight for next BiT.)

Direct or Charge:
 Charge means he charges lightning with standing on one leg.
 You can interrupt this Charge Attack, standing on one leg is good visual cue.
 Since you can interrupt, Single/Charge and Double/Charge are same for speedrunners. (Probably not known as well.)

Single or Double:
 I called "Direct" but he actually delays Double/Direct Attack (C and G).
 He delays but it doesn't mean you can interrupt. Be careful for Delay =/= Charge.
 You have to use Shield Bush but harder to get the timing since it's delayed.

So you have to think about 3 attacks from 2nd phase actually:
1: Fast Attack -> Shield Bush
2: Delayed Attack -> Delayed Shield Bush
3: Charge Attack -> Stab to interrupt