Shoot them from a distance and take your time. It can be one of the harder ones to do, try using sniper rifles or battle rifles and a long range scanner and head (I forget which ones....one of the tracking type recon units has a 450 range camera, then add on to that a head with a range of 300, it's a KE type I think)
Putting the WAR in Worhammer since 1999.
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