Who wouldn’t want a grappling hook in this game. All those roofs, trees, fences and cliffs waiting to be scaled up and down. Machines to be tethered into other machines and into bikes.
Avalanche i know you have the technology so maybe a DLC would be nice. Make it optional like the bikes on host side. Lets say a mad scientist called Rico Rodriquist made it but died after trying to tether a tank with it. 
