if you C4 someone, u can trigger it anytime. However, they can pass the C4 to anyone., INCLUDING YOU. For example, I c4 player 1 in the air, he can c4 player 2, 3 or 4 by touching them before I trigger the C4. In fact, players can pass C4 as many times as they want to.
P.S. having C4 on urself might not be bad because u can do C4ing up B.
P.S. having C4 on urself might not be bad because u can do C4ing up B.