All other companion skills don’t need to target anything, but Crowstorm needs to target an enemy to be effective. When casting a companion ability from Inspiring Swarm in Swarmblade Form the Crowstorm drops directly in front of the Storm Crow every time.
Normally Crowstorm targets your cursor location. Having the Crowstorm either still target your cursor or even target the closest enemy would be necessary for this to be a function node (Inspiring Swarm) to use with Storm Crow.