[DRG]

Short answer is yes they die a bit easier. It's a game trade off for their speed otherwise all the gamey players would load up with speed 9 bike infantry

Any HEAT type weapon is capable of engaging a soft target and given the wide range of possible outcomes deliberately put into the game killing all with one shot is just as possible as not killing any although killing all would be far more rare

If anyone else has time to expand on that be my guest

Don