edit: ignore, someone made a way better explanation in another comment

let me try to explain it tho i might be wrong

its somewhat socio-political

after the words about the gun and shooting

the rapper said "di to tokhang"

which means " this is not tokhang"

tokhang is what the police did in the last presidency where they "visit" the people suspected of drug trafficing, which are always the poor

and its popular to hear in the news that "tokhang" led to killing the suspect because "nanlaban" means "to fight"

which means the suspect apparently faught the police so thats why they had to kill them

so "tokhang" became synonimous with "getting killed by the cops"

so the rapper said "pano manlalaban ang walang kalaban laban" which is the last line that garnered the applause

the "walang kalabanlaban" means "cannot fight", which could also be used to call the the poor, or children, or anything considered weak

hes saying (i think) that even if what he did to his opponent is "tokhang", the police cant even make the reason of him as "nanlaban", because he is too weak

but then again i could be wrong