‘Are you sure?’ you ask

The man waves his sword in an arrogant but elegant way.

‘Yes definitely!  It has been foretold in the grand scheme of things.  I am to wait here and fight you when you finally arrive.’

‘Really’ you enquire

‘Ummm yes’ re replies ‘By the sword of my forefathers it is written and should I die then my brother shall avenge me’

Do you

Wave your sword in a uninteresting and fetid way and prepare to fight him

Say ‘Whatever’ and shoot him

Say ‘You’re making it up as you go along’