Dota 2 Mirana arrow trick
As you're leaping (mid-air), cast arrow on the ground at any position between the start and end point of the leap. That will send an arrow behind Mirana. You can do the same and arrow in front of the leap landing spot to cast a quick arrow in front of you. This removes the 0.5s cast time of arrow.
It's a nice way to cast arrow quickly as you're chasing/escaping.
0:00 Fast arrow
0:11 Slow arrow