Support Kills

I am kind of stuck on this one guys, what is your take on this situation? Let's say you are playing a Support, and you are in position to kill a target on the enemy team. However, not too far off is one of your carries that is going for the kill too, but he is still walking up and the enemy has a small chance of getting away. Do you take the kill for yourself to just get that player out of the way, or do you wait for your team mate so he can get some extra gold for it? I have always just taken the kills myself, I want the enemy out of the way so we can take objectives without wasting any more time. But I can also see the benefit of getting my carry more fed
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