It's getting to be a common thing now during the Lvl 24 Strikes that I see these kids race as fast as they can through the Strike usually hopping on their speeder bypassing the first several mobs of lower level enemies which is fine but then they continue on and bypass as many of the Lvl 24 enemies as they can just to get to the final boss quicker.
Why? The boss gives you nothing and your chances of getting anything worthwhile from the end game roll are poor odds for the amount of time it takes to complete each Strike. Your best shot of getting a Legendary Engram drop or at least multiple blue Engrams to give you a chance at Legendary gear and to rank up the Cryptarch is to kill every Lvl 24 enemy up to the boss because that is where all of my Legendary Engrams have come from and I get at least half of my blue Engrams from Mob drops to go along with what I get in the end game roll.
The Lvl 24 Tiger Strikes since the last patch appear to have a higher drop rate than the normal game modes at least in the areas you're facing Lvl 24 enemies, and so bypassing them to finish the Strike faster is just decreasing your chance of getting multiple drops. There's little other reason to be grinding Lvl 24 Strikes in that manner because you can earn Vanguard rep faster farming Patrols, Vanguard Marks faster farming Public Events, and if you need a bunch of Strikes for a Bounty run the Lvl 8 Devil's Lair on Earth and get them done quick.
So don't be that guy that runs way out ahead of everyone else. Don't waste you and your teammates chances for more Legendary/Exotic drops. It doesn't take but an extra 5 minutes or so to clear out all the Lvl 24 enemies your bypassing between you and the Boss when you do it as a group.
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Nobody says that you have to rush through along with the person rushing through unless your the only one taking your time in it then you wouldn't have a choice but by the time you and a friend clear the strike person 3 will be fighting the boss still. Unless he/she has a badass arsenal of gear to kill the boss in under 5 minutes it doesn't hurt any thing but the rusher missing out on the mob drops. Most every one I see rushing are 27+ in level and don't need to kill every thing on sight.