Gah, I'll tell the story properly. My sister wants me to go out with her every day for a month to the local mtb track to learn how to ride a mtb better and for fitness. So we've been going out for a week, she got one puncture and I got one. Got some stans, and as an experiment, fixed the punctures then put stans in those tubes, and left the other tubes stanless. Anyway our last ride on saturday, she got another flat in her non stanned tube. Then the next morning I noticed my non-stanned tube was down as well. After going over the tire, I notice that I actually have 3 thorns in it. So I fix the punctures and put some stans in the tubes. Then I think to have a look at the stanned tubes that didn't go down. Turns out they have a heap of thorns in them as well. So I pull the thorns out of mine, and air starts pissing out, and if I let the wheel spin so the place where the hole is is at the bottom, then the stans starts pissing out. So I spin the wheels and the holes eventually seal.

So back to my original question. Should I have left the thorns in? Another question, will that tube be alright to hold it's air with the stans, or should I patch the holes?