If you get a perfect block and use a skill it doesn't matter if you have enough energy you still use the silver charge of that skill. I only have 32 max energy with summons and I can use the silver charge of flamethrower which takes 35 energy to use. You still need the energy to cast the base skill but not the energy to use silver after perfect block.
Edit: It takes 40 energy for silver flamethrower.
Edit: It takes 40 energy for silver flamethrower.
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