Is it just me, or can a single 'shot' from a bolter kill multiple members of a horde? Or, does this represent the horde dispersing? Or both?
I figure that ammunition conservation might become an important aspect of play, since Kill Teams may often operate behind enemy lines, so abstract ammunition may not be great.
When killing Genestealers and Orks, for instance, you may need to terminate every single one with extreme prejudice, too, so dispersal may not be an option for a Kill Team, lest one get away and allow its taint to spread.
This might be awkward, I think.