Negative Mult?

Was working on the typecast challenge the other day (beat it hell yeah!) and I noticed joker stencil appeared after round 4. If I had it before every one turned eternal would it divide my score? Make it a negative score?

Was working on the typecast challenge the other day (beat it hell yeah!) and I noticed joker stencil appeared after round 4. If I had it before every one turned eternal would it divide my score? Make it a negative score?