Circuit breakers are designed with this in mind. They are supposed to trip based on power not just raw current. So if the breaker were to trip with 50 amps after 1 second, then it should trip with 100A in 1/2 second. Remember the breaker is there to protect the wiring, NOT TO PROTECT YOU. The wiring is able to stand short bursts of power over the rated limit so the breaker is designed accordingly.