Torts — Premises liability — Action against owner of shop where plaintiff was twice attacked by third party — Plaintiff’s status was that of an invitee where he was expressly invited onto premises by owner — Trial court erred in entering summary judgment for defendant where there was factual issue as to whether second attack on plaintiff was foreseeable so that defendant owed plaintiff a duty to protect him and factual issue as to whether defendant had duty to render or call for aid for plaintiff after the attacks — Court also erred in entering summary judgment for defendant on ground that plaintiff did not establish proximate causation — Proximate cause is typically factual issue for jury