For Triggers that rely on Hitting / Missing, the System will only evaluate the Trigger if 1+ Targets are selected. In the case of multiple Targets, each Target is evaluated separately for hits / misses, which is displayed in the final Chat message. For powers such as "1d3 in a group", you can select the max number (3) in the preference you want to hit them, and the System will pick them in that order in cases you roll less than max. If your target is random such as "1d3 random enemies in a group", the System will randomly pick instead.