A parody of Netero's pose against Meryem from Hunter x Hunter. Probably because Byakuren got a new Spellcard(The Buddha Chop) in HM ver1.30 that looks similar to Netero's 100-Type Guanyin Bodhisattva, specifically this They're both basically the same anyway, since Byakuren's is also made with her faith/spirit.
Now that I think about it, some of Byakuren's powers and personality are actually a mix of Netero's and Meryem's... Namusan, you're scary awesome!
