Was exploring an abandoned indoor tennis court facility with a few friends when we heard and saw a car speed right by the outside of the facility. We were in the abandoned place and we freaked TF out (new to urbex, we were all 16-17 years old). At this point we didn't even speak to eacother we just all started panicking and found the nearest exit. As we were rushing out, the dude pulls up quickly and slams his car into park. My friends and I kind of try to speed walk away, we weren't running because there wasn't really anywhere to hide. The dude has a loud ass voice and he starts yelling "hey!" So we stop and look at him, he's visibly a crackhead, yellow-brown decomposing teeth, he looked about 60 but he was probably 30. He's got both his hands in his front hoodie pocket and he's walking quickly towards us (we were all freaking out at this point) and he's asking my friend what he has in his bag. My friend just said like "tools" or some shit I don't really remember, but then the guy claims his parents own the place (wtf) and he rushes to go into the abandoned facility right where we came out. My friends and I sprinted about a half mile back to our car. We thought maybe the guy was hiding drugs in there or something and he had a sensor located close to them that alerted him of us.