You don’t care which guard is the liar. You want to find the correct way to go. So, you ask a question that will cancel out the lying guard’s lie, and only one question is needed, not two. The only question you need to ask either guard is, “What would you say if I asked you which way is the safe way to go?” The lying guard will respond with a double lie which cancels out and ends up being the truth.
A chainsaw is a gift that’s definitely a cut above the average…