Reid's delivery from out wide posed another problem for the Baggies after 29 minutes when keeper Scott Carson could only punch his cross on the head of the incoming Carlos Edwards, but he diverted his finish over the bar.
Dickson stabbed home a reply for Crusaders on 76 but Carson connected with O'Kane's cross to re-establish Coleraine's three-goal advantage in the 82nd minute.
The devastating cross-examination by fellow Dubliner and contemporary Edward Carson destroyed Wilde, leading to his later prosecution and imprisonment.