I'm not wasting my time considering that beating a strike gives me a chance at a legendary engram, and this random chance does not increase or decrease based on the time it takes to complete the strike. The faster I complete said strike, the faster I can jump in another and roll the dice at another legendary engram. If you want to mercilessly kill the lower level enemies that are present in patrol mode, and will continue to respawn no matter how many times you kill them, simply go to patrol mode.