Stage 4, Fulci Fun Center, against the boss Josey.
During his second phase, he will be in a flying saucer attempting to take you to outer space with Rosalind in tow. You won't be able to survive the trip, so take out his power sources. This will disable his barrier and allow you to deliver the final blow on him. However, the entire phase has a three minute limit to it, including the final blow. To get this, you will need to start the final blow within the lower teens (13 to 11) and press hard, for the final blow sequence will take about 5-6 seconds to complete and you don't want to push it into the final moments and risk getting a fail on the fight. Just keep in mind the five- to six-second length to try and frame it up yourself.