Hi everyone.
My group is going to do it's first Deathwatch campaign soonish, and we're going to be fighting Tyranids. In close confines. Most likely vanguard organisms. Bloody Genestealers...
Our group consists of a Night Wardens (Raven Guard successor) Apothecary (me), a Sable Wings (Blood Angels successor) Tactical OR Techie, a Crimson Fists Techie OR Assault Marine (they both haven't decided but there'll only be one Tech Marine in the team) and a Blood Angels Assault Marine.
So essentially, an Apothecary, Techmarine and either 2 Assault Marines or a Tactical and Assault Marine.
Anyway, I was thinking of picking up a Flamer since I was thinking how useful it'd be against Genestealers, especially in the close confines we're going to be fighting in (and reading in Creatures Anathema how they advised using Flame weapons), but then I realized... The way Flame weapons work - unless I'm missing something - means that most of the time, a Genestealer won't get hit by the fire due to having amazing Agility.
So Flamers -aren't- good against them? 
I... I don't get it... Especially since Incendiary Grenades can cause damage to them easily, but not Flamers...
. I'd be curious to know though how you threw grenades further than the 30m the heavy flamer has. As for the melee and assault marine issue, you'll hit those with ANY heavy weapon. Something I'd consider trying is talking to your team about working together a bit more fluidly- consider having the AM wait a little longer to engage in melee, or even wait for them to charge you (chances are he'll get more attacks that way anyhow). You still won't get past the 30m issue, but most creatures shouldn't have a 30m charge so you should at least be able to get a shot or two off.
