Originally posted by Dark-KenshinYes, but Gohan thought the fight was over, Goku warp kamehameha wouldn't be thinking fight was over. Also Gohan isn't Goku, and Goku is the one who is always getting hurt or whatever by guard downs. Majin Vegeta, Sorbet, Freeza in the newest episode, a rock to the head by Krillin. Gohan is the opposite, he goes Vegeta's route, and gets overly cocky when he is stronger than someone. The difference is, Vegeta lets them get stronger, and against Gohan they just pull out something that he can't stop and get away from him and then end up more powerful.
More or less! Check this out:Follow the dialogue closely. Here, we see for ourselves what a random ki blast from Piccolo can do to an off guard Mystic Gohan. If Piccolo can do that with a random ki blast, just imagine what a fully charged up super kamehameha from SSJ3 Goku could do (not that it's necessary to win here in light of the above clip). Not to mention that if it's a fight to the death, just trade out the kamehameha with a destructo disc and Goku has this in the bag.
Durability in DB seems to be tied around active concentration. When your guard is up, attacks that could destroy a planet won't even scratch your chin (see SSJ Goku vs Frieza). When your guard is down, you can be mortally wounded by a random ass lazer gun (see SSJB Goku vs Golden Frieza circa ROF arc). When Goku fought Majin Vegeta, it was a stalemate. However, the minute Goku let his guard down, Vegeta effortlessly KO'd him in one blow. Hell, this series has even gone to truly asinine lengths with this concept (ordinary machine gun bullets scratching current Goku's arm and piercing current Krillin's).