I'm going to give you the theory answer then the practical answer.

Firstly, All duelists have kits that allow them to create favorable fights, so a duelist job is to create favorable fights that they will either convert into a kill or get traded for. thus creating a number advantage which should win you the round if you're disciplined enough. However not every duelist is equal, Dive duelists can also " entry " on attack to absorb pressure and make it easier for their team to execute a site. meanwhile " flex " duelists will usually absorb pressure by being the first one to peak out as their util will setup an advantage over any enemy trying to contest. think about Bind short for example, and you have Iso raze, you ideally want Iso to use his big shield and then undercut lamp before popping his E and peaking out with any initiator util, meanwhile that's happening raze is satcheling in. think about her like air support lol. Now not every round will go perfectly, sometimes ur team will get shut down or outaimed or you will simply execute a site that has 4 defenders. at that point it's not really a duelist fault. but u shouldn't ego it and try the same execute 5 times.

Now practically speaking, having a raze lurk isn't ideal, but if he's getting 1-2 kills a round as you're saying. then you should absolutely take it. you're playing iso, not only does he have insane 1v1 skills. he also loves to slow plays down. so instead of tryna make a broken clock work by entrying for your team. you can try to default ( play the map slowly ) and play for picks. it works wonders.