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Remember! A spot only counts as one (with a boss) when its thin red beam locks on to you. Simply creating a question mark over its head won’t class as a spot if he can’t actually lock on to your position.
Ok, it’s boss time again! Begin by hitting the Red Button to reveal the whole room. Press the switch to create a hard light platform and run over as a shadow crosses by. Activate the panel, and then jump down into the pit when a shadow is passing back overhead.
Hit the switch again and now it’s time to enter the boss room proper. Follow the shadow by jumping up, hitting the switch, hanging off the next platform, pulling yourself up and jumping into the pit below the first security camera.
As the next shadow comes along, jump up and hop over to the terminal on your right. Begin hacking it and you’ll use up one of your four 'allowed' spots for the S-Rank. Drop down into the pit below the camera above you and do the same for the next pit when the next shadow passes overhead.
Wait for another passing shadow before jumping out and then immediately jumping up to the ledges above you. From here quickly leap up to the platform above and crouch-walk in time with a passing shadow.
Leap up in the shadow to the sensor beam on the left, and then leap right when a shadow passes by. The next shadow won’t be quite big enough to cover the whole hard light floor, so you’ll need to nip out just as it gets close to you. The brief time in the light should be short enough not to attract the boss’ attention.
Repeat these shadow loving run and jumps until you’re at the top with the terminal. Run past the terminal when a shadow passes over, then run left and hack the terminal as the next shadow reaches you (so you’re following the shadow’s movement path). You’ll likely be spotted by the Boss (but if you’re quick enough you shouldn’t be).
Drop down the left side in the shadows and then drop down to the next switch below as a shadow is cast over the light below . Hit it, and then jump up and over the green hard light when a shadow passes by. Crouch walk left; stand up in the shadow and very quickly ledge jump up to the switch above as the shadow is coming down.
Use a shadow to mask your drop down to the ground and run left to the ledges on the wall. Wait here for the boss to look elsewhere before jumping up and hacking the terminal. You’ll most likely get spotted here too, but that shouldn’t be an issue. Just be quick before dropping down and ducking back into the shadows again.
Once again wait for a shadow to come down and ledge leap up the hard light and jump over to the two wall ledges near the boss. Wait here until it looks away and if you still need the [Helix], now is the only time to grab it.
If you don’t need/want the Helix; simply time your drop down to the exit with a shadow. It should follow you down to near the exit, allowing you to escape unscathed.