You were scared shitless. To understand the context of why you were so scared, let's go back a few minutes earlier. You had entered an abandoned train station, there was a lot of cobwebs, dust, etc. Just as you were about to leave, you saw a train with lights on, you were curious because all the trains that were there had no lights except for this one, when you approached, there was a boy with a balloon, he was talking to himself, just as you approached the boy turned around almost instantly, that scared you so much that you fell to the ground, the boy was approaching little by little until...

Gus: Hello, are you lost?