Their intense emotional response to the "Serious Punch" and the high-tier animation of the final fight.
The reaction portion of this specific video typically starts after their intro and OP cover (around the 1:25 mark). Carlie and Ange One Punch Man 1x12 Miniplayer
Since reaction videos typically show only a small "miniplayer" of the episode or none at all to follow copyright rules, you may need to sync the reaction with your own copy of the episode. Their intense emotional response to the "Serious Punch"
According to Carlie and Ange's commentary, look out for these highlights in their 1x12 reaction: Carlie and Ange One Punch Man 1x12 Miniplayer