Both Gamemodes. Swords show the blue particles that are normally shown when you hit something and the enchantment on your weapon provides extra damage. This happens with all swords on singleplayer or multiplayer.
Environment
Windows 7 64 bit
Java 7
1GB in minecraft
Linked issues
Attachments
Comments 3
You find the most recent changelog here https://mojang.com/
Fixed in 13w36b