It was obvious that the gang was not like the ones they have faced so far. If they killed 2 B rank adventurers then handling C rank adventurers would be easier.
"Brian has a point. Even if we don't get into danger while investigating this unknown gang, as long as the gang isn't wiped out there will be a chance that they would come after us." Castiel pointed out.
"By now you both should know that the life of an adventurer is a dangerous one. I understand why you guys are afraid, but you have to remember that the school is one of the safest places in the city and the only thing that takes us out are our missions." Blake explained.
It wasn't as if he didn't feel that it was too dangerous, but the rewards and reputation from completing the commission outweighed the possible risks.
The payment alone was 150k gold coins and 15k contribution points.