Avoiding collisions is a tremendous capability in modern day drones and this is a nice portrayal. Unmanned Aerial Vehicles are capable of performing stunning aerial acrobatics, hunt other drones down and even go swimming underwater. However, obstacle avoidance can be considered one of the greatest attributes that a drone can have.
The Computer Science and Artificial Intelligence Lab (CSAIL) at MIT and Autonomous Systems Laboratory at Stanford have made unbelievable progress at creating immensely nimble quads that can dodge obstacles. To know if it really works, just have a look at this fencing duel between a human and a drone who really knows how to save itself from being stabbed! Well, may be a chainsaw drone would do even better! Or may be not!