From Forge of Empires - Wiki EN
|Attacks a row of enemies up to two tiles behind the target enemy without receiving retaliation. In total up to three enemy units can be attacked.|
Attack value is the same for all attacked units. When dragon drone gets attacked, it will retaliate, but it will not use the skill. If the drone is lucky enough to deal a critical hit, the increased damage will only affect the main target and not the units attacked as secondary targets.