With the knowledge Blake had in mind, Blake quickly told Robus about the plan that he had formulated along the way when he made his way back to Robus' location from the opposite end of the forest.
Robus wasn't able to come up with details of a plan as he had never done something like that before.
The only type of planning that he could do was to think about what next move he would dish out to his opponents.
Hence why when Blake presented Robus with the plan, the huge gorilla readily complied and trusted Blake's decision and judgment completely.
The plan that Blake had come up with might not give them a huge amount of souls in a short amount of time, but considering that they were right beside a hornet's nest, they should avoid kicking the whole hornet's nest and just do with picking up the hornets that came out of the nest.
So then Blake began his preparations before going through with his plan.