 El Santo continued wearing his mask after retirement, revealed his face briefly only in old age, and was buried wearing his silver mask.With the importance placed on masks in "lucha libre", losing the mask to an opponent is seen as the ultimate insult and can at times seriously hurt the career of the unmasking wrestler.Putting one's mask on the line against a hated opponent is a tradition in "lucha libre" as a means to settle a heated feud between two or more wrestlers.