“his own iniquities will capture him.” It is a consistent theme through Scripture that evil people bring evil upon themselves (see commentary on Prov. 1:18). The word “own” is added for clarity in English. The Bible makes it clear that God is not the one who decides who gets punished for sin and who does not. God does not make people sinful or holy, and God does not randomly pass out retribution for sin. People are captured, suffer, and are eventually punished by and because of their own sin.
“will capture him…seized by.” This is the figure of speech personification, where iniquity and sin are portrayed as people who capture and seize and tie up people who defy God by acting sinfully.