(ragnarok @ Aug. 22 2006,12:35)
QUOTE
I'm not too sure about WE blocking the flamer attack to units behind it.
For something like a Gargant I could understand, but how do battle wagons stop the flames? Inferno guns (and their hopeful tyrannid equivilents) are fired from a higher position, so they would wash down over the wagon and still pour over it into the boyz behind.
Similiarly against bipedial WEs (so any titan class except gargants) I can see the flames being played around its lets, so they can wash pass, as well as being used to fuse the leg joints.
The point is not that the stream couldn't fire past the WE, but that it is intentionally targetting the WE to the exclusion of other units in order to get the DC/2 attacks. It's not necessarily a literal physical block.
If you don't want it to block, don't centerline the template and take the single shot against the WE as you hose over/between the legs/whatever.
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Another option for the "hose down" would be to place a single normal barrage template on top of the target WE. Then the rules are exactly as a normal barrage - DC/2 for the WE and everything in the "splash" radius is hit as normal.
Of course, that's getting more fiddly...