Cryptic Quiz

[megfitz]

I've posted these last few questions before but didn't get any replies, any help or suggestions welcome as my brain is in meltdow over these!!
Headed Fighting Talk::Self-destrucing professional...2.3.5.2.3.5.5.3.2.3.5.
:: Keep your bandanas on....6.3.5.
Many thanks.

[Colliewobbler]

He who lives by the sword shall die by the sword
Less sure about the other - various possibilities: Bonnie and Clyde; batman and robin; Battle for Earth??