I've experienced several similar situations. Once, at my regular, there was a new guy who mimicked everything I did. He'd follow behind me, doing the same things, and then just stare, seemingly waiting for my approval, but he never spoke. I got a weird vibe, so I just left and I haven't seen him since. Another time, some kids watched me struggle with a trick. Eventually, one came over and did it right in my face, as if to show me how. Thanks lil guy. I've also been on the other end..I'll find myself repeating the same few tricks until I see someone else trying something new and think, "I could do that." I'll ask if I can join in or try the trick after them if that's ok. A good way to start conversations and learn. But communication is key. Without it, you're just being dick.