Thursday Morning Riddle

I am one of four elements from an old school;
I’m the act of combustion – the burning of fuel;
I’m the discharge of weapons in war or in duel;
Terminating employees can often be cruel.

Who am I?

UPDATE: Riddle solved by Little Fish. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Little Fish Says:

    Fire

  2. Bill Says:

    FIRE is correct. Way to go, Little Fish!

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