How to tether two objects in Just Cause 2
Solution 1:
It's similar to a click-and-drag operation. Target the first thing you want to tether, press your grappling hook key, drag to the second object, and let go.
There are some limitations -- range, possibly turning to face the opposite direction for your second object. Also, if the first thing you want to tether is a person, they generally get grappled unless you are very fast. If you're trying to tie a guard to a wall or something, it's easier to target the wall first and drag to the guard.