Its not even the running.
I can make it across the table moving and hiding if necessary. Ie, using that grey stuff.
However, Harlies have to charge to be effective.
Unless I'm far enough into my campaign and have 2-3 N/Disruptors.
Which is like 1 per game I've played as an upgrade.
Harlies shooting is Awesome.
BS 5. But range 16" max... so. Charging is 9/10 the best option is most situations.
But not all.
Slick makes it one of those situations. Where charging is too much of a risk for an elite army with 3 models on the board.
Orks, they are fine. They can absorb the casualties.
GK,Harlies,Nids cant.
Tbh, it hurts nids the most. Low model count, 3 wounds and your still downed?!