That is something that cant be explained you will have to go to a doctor or a medical person or physician for that . or try avoid using a cold shower take a hot shower
I think, it is because u took a cold shower so u couldn't move ur legs. The blood of ur leg freezed so... u couldn't move but there's no way u to felt like ur legs are in a fire cause u didn't take a hot shower.
So first of all i need to know what it the thing they are asking that would influence the person? What is the action? Based on you're comment below I will then comment back with the answer, Thank You