He threw himself off balance. That's what ultimately saved Oliveira. Didn't have enough in the tank to get the ground and pound finish.
He's made good money and had an exciting ride entering the UFC late into his career in his mid 30s. I think his stock and opportunities rose again after this.
Chandler is always dangerous. I'll never forget that epic fight with Eddie Alvarez in Bellator. Same month as Hendo/Shogun I