I remember the one time I went to 'camp' (outward bound if you know it)
I was 16, and in the late evening when all the kids were busy socialising before being forced into their bunkhouses a girl got talking to me, telling me how she had seen me complete one of the difficult physical challenges and her group were very much impressed. This coming from someone a similar age, I would probably consider flirting, coming from an older person I would assume as a parenting style pat on the back of encouragement.
Problem is, I could absolutely not tell how old she was, and therefore whether she was either a kid on camp, or an instructor! She could have been anywhere between 13 and 30, I had NO IDEA. I settled on the latter, which was a big mistake and it freaked her out somewhat.