Another bug!

Spudow probably used a Galacta-cactus, which makes him do 1 damage to himself when the Galacta-cactus dies. Thus you only do 19 damage when you kill him. No bug here.

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@thomas99313 wrote:

Spudow probably used a Galacta-cactus, which makes him do 1 damage to himself when the Galacta-cactus dies. Thus you only do 19 damage when you kill him. No bug here.

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That's a pretty good analysis my friend. That's probably what happened.