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Sometimes they may die, others may have time to create a ball, therefore trapping air between their leg hairs that can sustain them til they are washed onto a dry ledge, supposing they reach one, or manage to spin some web lines to secure themselves against the current, which they can then use to climb back up, (and sometimes back out through the plug). nb, scalding water will kill them, so if you really can't bear to touch them or get someone to help, use hot water) personally, I just pick them up, they can't really hurt us (UK domestic breeds).
The glass, starvation or lack of water/fluid. The glass is not likely to form a perfect seal with the surface therefore allowing enough o2 through for our little friend to breath.
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- thanks!