Skydiving emergency cut away - Entanglement

When working in Skydive Spaceland Houston as an Videographer in 2014, I was packing my parachute in the public accesible packing area, and after put in the bag I was called to the manifest. When I came back I noticed the bag was not in the same position I let it before, nothing wrong, but just in a different position. I finish my packing and jump. Well, I had an entanglement, my first Skydive Emergency in a single after 4500 jumps. I follow the procedure but I rush the reserve deployment, so I opened facing up.
I conclude that someone (maybe a non-skydiver) just walk over my lines and then reposition the bag.
Lesson learned: always keep your gear in the view and don't interrupt the packing process if possible.
Main canopy: PD Velocity 103