"---think about it why no stall during the top of a loop or the summit of a hammerhead [near zero on the ASI sometimes]" ?
No Takers? OK then,
---because, the flightpath of the aeroplane has been adjusted to 'keep up' with the relative wind'---so at no time is the stall AoA achieved
...which also results in the airplane being in a near-zero-G (ballistic) state, thus wing loading is very low.
In a hammerhead, the wingtip on the inside of the turn may actually be flying backwards, if only for a second.