My interrupt build(for PvE and PvP):
WS: 14 (+4)
Exper: 14 (+2)
Marks: 9 (+1)
Punishing Shot [E]
Read The Wind
Res Signet(PvP)/Rebirth(PvE, if R/Mo)
This a is a great build to shut down most Eles and Necro's. Use Serpents Quickness to improve the Interrupt moves' recharge, so you can interrupt more frequently. It's also a nice build to learn and practice interrupting.