Quote Originally Posted by Pomelo View Post
To be honest guys I don't understand the tooltip of the new surecast at all, can you use it "WHILST" under those negative effects or do you have to use it before even being inflicted with them...it's honestly confusing to me.
The thing about sleep and stun is you are disabled for the duration of the effect. So you couldn't use it under these conditions. It has to be used prior to avoid the effect.

As of right now, if you are in midcast and you get slept or stunned, it will interrupt your cast. After the update, this will no longer happen since you are immune from sleep, stun, knockback, and draw-in effects for 10 seconds. Knockback and draw-in effects by themselves won't disable you. There are usually additional mechanics that do this. However, they will interrupt your cast by the nature of moving you from the spot you began your cast. Under the effect of Surecast, enemies will no longer be able to do this to you for 10 seconds or you cast a spell.