SCA Equestrian Handbook - April 2020 Edition - Page 18 - Section IV.C.2.b
(b) Spears and javelins
(1) Spears and javelins may be equipped with metal tips. For a ground target, where the intent is to strike towards the ground at the target while holding a spear or lance,
a. The overhand technique (hand on top of the lance) shall be used. The shaft must be held in line with and pressing against the underside of the forearm, and the grip shall be maintained at all times during the strike and the lifting of the lance after the strike.
b. There shall be no throwing/releasing of a spear or javelin at a ground target within close proximity of the horse (within 5 feet of the horse).
c. "Ground Target" does not include target stands resting on the ground.