Ah whoops, guess I've never actually tried summoning for an area I've already cleared before. I wonder if not being able to summon for that guy was a design choice, or if it's only a byproduct of not being able to put down soapsigns in a boss room.
But yeah shades can help with bosses. Spend too much time with them before fighting the boss, and you may find them disappearing in the middle of the boss fight lol.
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