Well, there is another alternative to feeding if you cannot kill your enemy.
Run, RUN! Make them chase you! If you know your stuff you will make them waste their time and ammo till the bigger, badder kill whoring aliens come back for booster food. Very effective as a basi, grabbing, slashing and running is a good way of getting attention of players and keeping it.
This works best playing smaller, less intimidating aliens such as basis and dretches, you dont wanna scare em away, and people get angry if they can't kill that running dretch/ basi.
Other funny thing is making Luci'ers kill themselves. Evolve basi, grab a luci, slash a couple of times, back off (luci shots are easy to time since they require some charging time to do noticeable damage).
What does a luci user do when he gets grabbed by a basi? he charges a hell of a shot and tries to luci jump, killing you doing so.
But as i said, luci shots are easy to time, and you are not there anymore, the lucijumper does a completely useless luci jumps, taking damage from both luci spalsh and falling.
Right after that luci jump, the lucifer user is often somewhat disoriented, and it is easy to grab him once more and make him do the same mistake.
But in the meanwhile, he is starting to understand how you are planning to kill him, so he changes tactics, what he does is that he tries to keep his distance, shooting smaller charges.
But, as the smart and fluent basi you are, you change tactics with him. You get a real good hold on him and slash until he stops fighting, stops shooting which means you should back off since he is either loading a huge charge again, or he is out of ammo, and it is more likely to be the first thing happening.
So you back off and lets him do it again. Now doing this, you are bound to take gradual damage, so you should leve him for the bigger aliens when you are low at health, you will probably get the evo anyways after that.
In the worst case you will probably just scare him back to his base, which is good too.
Of course this is dicey buisiness, because you have the risk of catching a full luci charge head on.
But its a fun way of making em die.