In Episode 11 of Death Note, The second Kira seems to want to take the life of either the head of the NPA or L, simply by telling them to show themselves on TV. What if they don’t show themselves on TV? Did the second Kira hold something over them that was not explicitly mentioned in the video tape? In the anime, it does not make sense; in the same episode, it is mentioned that the leaders of every nation pressured real L to be on TV.
Please note that I am not asking how the second Kira performed the kill in general. My question is: Why does the head of the NPA or L have to show themselves on TV, just because the second Kira asked them to?