Ok, if you're DPS is decent, and considering this is normal mode we're talking about, this is quite simple. Grab an interrupt team and keep them on Halfus 100%. Easy enough, you wanna pull halfus so he runs to the storm drake and release the storm drake on the pull. Also release the Nether on the pull and depending on the gear of your tanks, and the state of your DPS, you can either 2 tank this or 3 tank it.
2 tanking will require CD stacking but the drakes will drop quicker. Get the OT to take both the Storm and Nether and drop the Storm ASAP. And I mean fucking ASAP. You will want to pop BL/Hero/TW/AH here. After the storm goes down, kill the nether drake. Then leaving the time warden down, just nuke the fuck out of Halfus and there you go, free loots.
3 tanking is the same except it requires no CD stacking and tanks will take a drake each and the boss on a seperate tank. Easy enough. Here though, it's vital you tank all 3 together to capitilize on cleave damage.
The reason I advised you to leave Time Warden down is because, unless you have the whelp group, it's incredibly easy to just heal through the ~20k hits from those pathetic fireballs. So as long as your healers are slightly geared, you should have no issue. We managed this on the 2nd week of Cata by only releasing 2 drakes, and it's the way we've done it ever since. I do imagine this won't work with less DPS or on heroic mode though.