Before you leave:
There’s a couple of things you can do in certain conditions:
1. If there’s no yellows in the enemy team, you have 30s to go and the enemy team opponent is an idiot
In this case, take him/her as far away from the capture zone as possible, and when 20 seconds remain, rush to capture. Really douche move, I know, but hey, lands you the W.
2. If you're on Damage Depot and your opponents are not coming up + they are mortar users
In this case, start capturing until they try to break it. Then pretend to retreat. Now they feel obligated to capture, so you can take your pick from THREE different entrances (four if you have a grenade) to pop attacks at them. They will be so busy trying to hit you that they'll most probably forget to check each others' statuses. Whittle down and terminate.
3. If you have debuff weapons in a 1 v n situation
Those weapons are super useful. Know the exact values of damage they are capable of, because debuff weapons deal WAAAAAAY more damage than they let on. Burning your target also causes them to retreat, fearing a follow-up blast/excannon attack. Use that to your advantage when you don't want an opponent to follow you.
Some videos for reference:-
1. 1v4 battle: The importance of ranging, switching flanks, and truly knowing your ship.
VIDEO
2. 1v3 battle: The importance of knowing how to deal with trapsetters, keeping your cool and not giving the enemy a chance to retaliate.
VIDEO
3. 1v2 battle: This is slightly irrelevant these days, but here goes. The importance of using a knowing the map, psychological manipulation and using a DoT weapon.
VIDEO
4. A guest appearance by @JoshW that shows us the importance of not being too greedy for that kill!
https://replay.battlebay.net/MJXKKKYF#JXSFJGCB
Also, you might find this scenario-based guide to be handy to maybe learn some new sneaky tricks