This act shall not limit the liability which would otherwise exist:
a. For willful or malicious failure to guard, or to warn against, a dangerous condition, use, structure or activity; or
b. For injury suffered in any case where permission to engage in sport or recreational activity on the premises was granted for a consideration other than the consideration, if any, paid to said landowner by the State; or
c. For injury caused, by acts of persons to whom permission to engage in sport or recreational activity was granted, to other persons as to whom the person granting permission, or the owner, lessee or occupant of the premises, owes a duty to keep the premises safe or to warn of danger.