Spyderman reviving with dormammu/hood/mordo sinergy

We were going to kill our AW war boss, a 5 star 3/45 duped spyderman but something strange happened: one of my alliance member killed spyderman but he revived with 60/70% health more or less... we didn't do the calculations because we were baffled and we went straight in to kill him again. After thinking about it, it could have been possible (the double sinergy plus the recovery mastery if it actually works in this specific case)... the problem is... Spyderman can't be revived because he isn't a villain!! We don't have any screenshots sadly... but I'm 100% sure on what I saw... and it wasn't a visual bug because when I went in, spyderman had recovered health!