Sudden p. Horrida death

[Aracnophile]

One of my 4 p horrida just suddenly passed right after molting. Any possible explanation. For context I was trying to energize it with some water but to no avail.

 

[Veno Manus]

Could have overdone itself while trying to squeeze out? The molt process for any invert is tiresome and makes them weak. But with insect it's truly a mystery at times.