Guys, he's exposed all the lights, he just hasn't hit the switch to expose the last eye, which is initially covered by a stone platform, which IIRC, must be hit by going around merged to the wall.
Or just stand underneath and to the south of the switch a little bit, and throw a bomb up towards it right before the bomb explodes. Timed right and the bomb will explode and trigger the switch. It's a nice little trick.
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