Sylus bug will result in VERY bad things if unknown to Sylas player and teammates.

In the image you can see that Nocturne ulti is still up for Nocturne, but Sylas's ulti is down.

In the same image you can see everyone is Near-Sighted, Which screwed the graves over and the thresh.

Meaning that you can't even use Nocturne ulti. Also. Stealing a Nocturne ulti also makes Sylas Near-Sighted.

100% do not recommend stealing Nocturne ulti unless you are far sighted and need to balance it out.