Both times Silver appeared to try and kill Sonic, Eggman manages to sneak in and kidnap Elise, which resulted in him (albeit unintentionally) saving the world, because if Elise witnessed Sonic being killed by Silver, she would certainly have burst into tears, thus releasing Iblis.
Then his battleship exploded. Way to go! You're a hero doctor!
Then his battleship exploded. Way to go! You're a hero doctor!