doubt regarding december long challenge

challenge
december
long
meatball
question

#1

Note that when you receive an answer −1, you should immediately terminate your program to receive a Wrong Answer verdict; otherwise, you may receive any verdict. --------what is the meaning of this sentence?


#2

This is what I understood :
if you get -1 then just terminate the program or else you may get TLE,WA,RTE,internal error etc (anything) as verdict and you won’t be able to recognize what is wrong with your code…


#3

Does this not mean that I read -1 and I send the control to that part of code which will give correct answer(say) to that particular test case.