Debunk my experience

Tim bases his bias on the presumption all brain activity ceases immediately once blood flow to the brain stops. Research indicates that may not be so.

I base my bias ? Shouldn't good sceptics refrain from drawing conclusions ?
As to brain activity ceasing when blood flow is stopped, that's not quite right (apparently). The electrical activity (deemed to be the basis of consciousness by medical science and most materialist sceptics) ceases after 10-20 seconds. The brain stem doesn't function anymore (without a brain stem there's nobody in there, apparently) 

It may or may not be the case that some neurons in the brain are still exchanging chemical signals with each other for some short period of time but during cardiac arrest (complete heart stoppage) consciousness is absent.