'Tag' is a complex game involving many complexities. Someone must first be 'it'. Once decided this temporary pariah tries to tag someone else, using stealth, speed, resourcefulness and predatory instincts to transfer his or her 'it-ness' to the other person. You can only tag someone with your hand. So if someone who is 'it' tags you(with his or her hand) then you become 'it' and they are no longer 'it'. They are free of 'it' and can return to normalcy. You cannot immediately transfer your 'it-ness' back to the person who was just 'it', because there are no 'tag-backs' in Tag. The only way to lose is if you're one of the last two people on earth and are tagged by the other person. (Remember, no 'tag-backs'.) However, it is conceivable to procreate with this person and tag the offspring.