Well thinking all of this you can say he already came very close to the core area of the gate. Suddenly after coming to that place he realized that the heat of the place already increased and most likely it had already become 90 degree Celsius. Naturally this would be enough to kill any normal people but fortunately for all the Warriors they could still be in a situation like this and with that they will not have any problem or you can say even if they have a problem that it is only that much that could kill them.
Well also when someone reaches a more advanced level the capability of their body also increases. Because of these right now if any special grade or higher than that, warriors were present in that place they will not feel anything in a situation like this. Well you can say that even Allen also realized that because he did not think you would be able to adjust this quickly if he did not increase level to level 40.