Sensing them jump towards the cave, Eric had an urge to immediately follow after them, and quickly deal with them, but the next moment another thought was born in his head.
Since he wouldn't be able to find so many good sandbags for practice in the near future, then why didn't he just use them to the best of their potential.
With these thoughts in mind, he decided to increase the level of his puppet to 99 and wait for the new arrivals to appear.
Even if he had to face all 6 of them at the same time, he was confident in his abilities to control his Blood Clone so that he didn't die immediately.
In fact, he thought that he could give them a good run for their money. Furthermore, even if they destroyed his Blood Clone he wouldn't suffer in the least, so it was the best situation possible.