Leo is a 5 year old Bengal who goes into this crazy mental zone every now and then shortly after I'm playing around with him and then he gets a crazy look in his eyes, makes a weird noise and if my right arm goes near him during that time he will latch onto it with all 4 paws, claws out and bite into it hard

what is this exactly, anyone else experience this? How do you stop this behaviour?

That is play aggression. He has become overstimulated and views your hand and arm as his prey. How are you "playing around with him"? What type of play or toy do you use?

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~ Kyenta

Mine gets that way when playing. He will attach himself to my leg. Thankfully, no claws or teeth come out. It seems the more we play, the more he wants. You need to try to redirect his aggression with a toy and let him go with it. For Raiden, it's his TNR wrestling buddy! He will kick the crap out of that thing. Cost me $7.95 and he has yet to tear it up. Once he gets done with thumping that to bits, he's happy and settles down.

Pearl my 6 month old does this, she seems to get out of control and throws herself at me and bites, I try not to get her over stimulated or just move out the way when she gets like this and she will attack a cushion instead, my 4 year old boy doesn't do this at all.

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Clare
Magic (brown spotted boy born 31 March 2012)
Pearl (seal Lynx Point girl born 1 October 2015)
Bristol, UK

I think they all do this. My boy usually will attach our feet and legs under the blanket, leap into the air, land on them, start kicking, biting, latching on etc. They’re just playing. Distract him with a toy or get him something like a Kickaroo that he can freely kick, bite and tackle without causing any harm.