A Taste of Anxiety is the 53rd episode of the Katekyo Hitman Reborn! anime.
Everyone in Tsuna's family is worried about the outcome of the Cloud battle. If it's Hibari that's fighting, then they should have a one-hit K.O, no-worry win. However, when it seems that the daunting Gola Moska is more than he appears to be, even Tsuna, who's still training to complete his Zero Point Breakthrough: Revised, gets very worried.