Ok, just some further info.
I entered the instance, prepared with whips and ring, and started taming. I am currently a lvl 13 Animal Tamer. I got the message that my taming skill was not high enough, so a higher taming skill is needed. What exactly the level required is I cannot say. After running back to the exit, the tower killed the Aleef I started taming and which was following me. ( I did this to immediately try and save time with the hope of a respawn to re-enter when my skill was higher. After exiting i re-entered the instance, and a new Aleef spawned, so currently i believe they do respawn if killed. I exited the instance again, however the clock for the instance keeps on running down even when outside the instance.
So even though this attempt was a complete waste of a key, hopefully others can learn from my mistakes and be more successful.
Best regards, Hof and Uber to all,