The former champion- Bigdash started the round with a big strike, and as De Ridder shot in for a takedown, he was caught in a tight guillotine by the former champion and nearly finished.
But after a minute being trapped, he escaped and ended up catching a modified inverted triangle choke from bottom side control to get the submission. De Ridder retained his light heavyweight champion, and is still middleweight champion as well.
He called for a shot at the heavyweight title next to become champ-champ-champ! Something no one else has done BUT Aung La N Sang was middleweight and light heavyweight champion in One and while champ champ did defeat the heavyweight champion of the time- Brandon Vera. However, Vera had moved down to 205 to face Sang. So, though he had defeated champs of all 3 weight classes he wasn’t a 3 weight champ. If De Ridder accomplished this he would be the first to ever do so in a major promotion.