Ordinary cacti were not a threat to Luo Yu and the others. They had the power of Falsified Sky, and none of the cacti could even defend themselves against them.
However, Han Sen also realized that Luo Yu and the others had only practiced the first half of the Falsified-Sky Sutra. He didn't understand why Luo Haitang hadn't even taught his direct family members the complete version of the Falsified-Sky Sutra.
As for Luo Yu's body, it also looked strange to Han Sen. Both his strength and speed seemed to have reached super level, but his life force didn't seem as strong as it should have been. Instead, it had stayed at the sacred-blood level.
Han Sen didn't know that Luo Haitang had obtained a life geno essence a long time ago, but he wasn't able to absorb the life geno essence because of his practice of Shura Change.