Might be a bit hard to understand what I mean, so I'll do my best to explain.
If you're standing about halfway on the bridge at alliance base, theres a way to port into the north baldar bunker as a (combat) rogue.
1. Be combat with Killing Spree.
2. Attack any alliance standing on that bridge within range of the bowman.
3. Use killingspree on the alliance. The bowman should also attack you now that you're destealthed.
4. If done right and with some luck, you will now "port" to the bowman with killingspree. Use vanish and then cap the flag
It's reproducable, but seems like it works around 50% of the time for me. Also seems like this only works if theres only 1 alliance on that bridge within range of Killing Spree.
(Ps, yes, this is an exploit since you're porting way further than the range of killing spree actually allows)