kpandthesunshineband/Blatherskite - what you said about the animal being tipped upside down first was what I observed too in the Halal slaughter I saw but it was a sheep.
I agree that there will be some distress in that but I would say it is a normal reaction for the animal to wish to right itself and so yes 'it struggles'. However, after a brief period the animal usually calms if pinned correctly. That lead up period is to some extent abnormal but not in my view cruelty per se but actually a part of ensuring a quick and relatively pain free death.
Cattle are typically pinned by the neck before stunning in a normal abatoir which to some extent also causes a struggle but neck pinning is a common technique on farms to treat animals as is turning cows over on their backs with ropes to deal with twisted stomachs and more especially during calving.
All slaughter involves some pain and distress. The important factor is to take every possible step to minimise that. I believe traditional Halal slaughter does that even if there is no prior stun.
Incidentally, I also believe that animal cruelty and stress is far far higher during the transport/marketing stages before slaughter - an area that is very badly monitored in comparsion to slaughter regimes.
Dont even get me started on how animals were slaugtered in the Foot and Mouth outbreak. That undoubtedly breached normal humane slaughter standards in a large number of cases.