Stun Duration Question

[goblinmob]

The example I'm using is the Druid's Whirling Wind @level5

It says it has a stun duration of 0.0 so I'm not sure what the point is. Will it disrupt spellcasting or something?

[mcoy]

Yes, it interrupts spells.

-Mcoy

[goblinmob]

Yes, it interrupts spells.

-Mcoy

Thanks!