[Solved] I tell him "don't attack the yak!", he attacks the yak

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if hero.canCast(“chain-lightning”):
# and
if hero.isReady(“chain-lightning”):
# are equivalent

hero.canCast("chain-lightning", enemy):

defines if hero can physically attain the enemy ( you can see the enemy with see-through-wall glasses, but you cannot harm him)

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This was the answer to your question in How to cast "chain-lightning"
You are attacking the yaks because the bounceRange is 20m and bounceCount is 8.