Adversarially? That doesn't sound especially compatible with the sacrament. Sacraments are generally freely received.
In any case, you can't baptize an adult against his will. In extreme situations, when a person is in, say, a coma, there can be a presumption of consent, but as I understand it, if the person in question was totally hardened against the very possibility of baptism, then the presumption would prove false and no baptism would have occurred.
FWIW, the LDS isn't really Christian. The theological differences are just too vast. Indeed, AFAIK, while the Catholic Church recognizes the baptism of many Protestant sects, it does not recognize the validity of LDS baptism. So a convert to Catholicism from the LDS must be baptized as part of his conversion.
In any case, you can't baptize an adult against his will. In extreme situations, when a person is in, say, a coma, there can be a presumption of consent, but as I understand it, if the person in question was totally hardened against the very possibility of baptism, then the presumption would prove false and no baptism would have occurred.