Saw a ghost in the woods?

Today me and 2 of my friends were in a wooded area in-between a small medical clinic and a bike trail which is about 15 feet lower. and after being there for around a half hour we all looked over and saw a dark man-like figure appear about 30 feet away from us. But the thing is he wouldve had to climb up the 15' hill from the bike trail and we would've heard him. But he walked across the trail into the darkness and we all jumped up to go see what he was doing and as we walked by were he was we stopped and I watched a small fire just appear from nothing and we immediately left the other direction. But the after we came down onto the bike trail we saw a man in a wheelchair hold onto a kids bike as he went down the trail. What would a guy in a wheelchair be doing with a bike. We followed as he stopped were we had to go to exit the trail and a small child none us noticed before ran from infront of the wheelchair man into the exit of the woods.. As we went past the boy he was coming out the exit we were entering on a different bike.. Everything that happened was weird and I don't know how to explain it.. It sounds weird but if you were there you would understand how crazy and unbelievable it all just happened.. Tell me what you think