4168 Snowboarding down a slope without looking, while engaging in a snowball fight, could constitute reckless conduct to which the doctrine of primary assumption of the risk does not apply.
MAMMOTH v GRAHAM (Snowballing Snowboarder) 135 CA4 1367 [See: Knight v Jewett 3 C4 296, T/AT 10/92; Lackner v North 135 CA4 1188, T/AT 2/06; O'Donoghue v Bear Mountain 30 CA4 188, T/AT 11/84]
No guarantees.
Always check current status of cases before citing them.