Animation response

Diagram of a room with open door.
Triangle moves in & door closes.
Smaller triangle and circle approach from outside.
Big triangle leaves and interacts with the other two shapes.
Circle goes into room & closes door. Triangles interact.
Big triangle comes in. They interact.
Small triangle opens the door. Circle goes out & interacts with small triangle.
Big triangle leaves room and chases smaller shapes around the outside of the room.
Smaller shapes leave.
The big triangle hits the room and starts taking the room apart.