it's the superfluous 'my' before setting $knife_back to 1. that causes $knife_back to have a value of 1 only inside of that block (it's a completely separate instance of the variable, actually). total newbie mistake on my part.
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I muck about @ The Forge.
say(rand 99>49?'try '.('0x'.join '',map{unpack 'H*',chr rand 256}1..2):'incoherent nonsense')while our $Noport=1;
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