It's so the thought that counts, people --
Twice i have been pushed way out of my zone the worst was i imprompu suprise tickle session in a basement store room in the dark it was full of shelves and storage racks, no safe word, and i passed out, came round and off they went again once i was ok and the final humiliation was loseing control and peeing.
I was told and worked it out that it was 45 mins but it seemed in one way like 2 hours and yet in another way a lot less.
I never ever felt more tired and completely drained of engery and my throat was sore from laughter and screaming.
If there was no understanding beforehand that this would be agreeable to you, and it doesn't sound like there was... that's really nasty, you'd have been or would be totally in your rights to (get even, either with the same treatment, or several consecutive and very hard
or legal action for imprisonment & assault...)
Before I knew what a safeword was thanks to this site, I did encounter someone who didn't know I was into this. Too late I realized he
was, and not the nice variety, though it really wasn't that long; I was at least as pissed I didn't see it coming (and that I didn't reciprocate afterward, see above)
--- but the point was the asshole totally ignored what would've been the equivalent of a safeword, not a decent human being. Especially since he *thought I was totally vanilla... In his mind he was imposing himself upon someone who didn't even share the fetish. Another jerk I met years later was aware of my interest, but that didn't excuse him either, both idiots were totally selfish & inconsiderate if not abusive.
There's obviously a difference between being playful and being abusive. I can take a BRIEF playful, unexpected tickle with no previous agreement,
but if someone's pinned down for unexpected extreme and/or lengthy torture the aggressor needs to be taught that's just fucking unacceptable. So he or she will REMEMBER it....
I don't appreciate creeps who impose their desires while not giving a flying fuck about anyone else's preferences or well being. Whether or not they know you're into this, but even if they do, that's no excuse to impose torture. And if you've heard me say this before, too bad
😛 It should be common sense, but doesn't seem to be.
If the Ler was at least aware you harbor fantasies about pushing limits, that MIGHT be another story, but there should still be a safeword in place if there's any uncertainty 
Even if they just tell you they'll stop when you say Uncle or something like that... Unless you told the (ler) you want that, he or she needs to at least provide an "out" even if it is a spontaneous/unplanned tickling...