Xue Fanxin did not know what the red beam of light was. Her intuition told her that it was extremely dangerous, so she dodged it and reminded her companions. "Get out of the way. Don't get hit by the light."
Heiyao and Heiran were experienced people and were quite agile. Furthermore, they were prepared, so with the reminder they quickly dodged the red beams.
There was no need to mention Little Lei. He could easily dodge the red beams.
However, what happened next was unexpected.
In the beginning, there was only one rock monster and one red beam. No matter how fast it was, it was not a problem.
However, a few more rock monsters appeared in the surroundings. Their numbers kept increasing. From the original one, two, three, to finally ten, there was a huge commotion. Presumably, other rock monsters were approaching.