in my experience, PayPal CANNOT actively take funds from your bank account. There's some legal issues there. They will just put your account in a negative balance and not allow you to fulfill any transactions whatsoever until the balance is taken care of.
I was in a situation where a dispute was risen and they put my account in a frozen state for $163. My bank account is linked, but not a penny ever left from there.
Still, to be sure, might be wise to de-link a bank account. PayPal isn't known for having good service.