Maintenance for the week of April 22:
• [COMPLETE] PC/Mac: NA and EU megaservers for patch maintenance – April 22, 4:00AM EDT (08:00 UTC) - 9:00AM EDT (13:00 UTC)
• Xbox: NA and EU megaservers for patch maintenance – April 24, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
• PlayStation®: NA and EU megaservers for patch maintenance – April 24, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
It will apply to the attack you execute from stealth AFAIK.
Note, though, that a skill like Lotus Fan does not drop stealth, and this mechanic might apply to other skills as well. Just putting it out there.