He's not riding as a domestique, is he? He finished a minute behind Evenepoel, which means he had plenty in the tank to ride his own pace and distance Almeida and Rodriguez. That means he could also have chosen to pace Evenepoel after Vingegaard's attack for a while and ride until he came to a halt, but then he would not be able to defend his own GC. He is supposed to be a good descender, but on Galibier he wasn't able to bridge to Evenepoel who was only 15s ahead. Others from his group were actually able to bridge to Evenepoel (Rodriguez, Roglic, Ayuso), but he stuck with Almeida.