This could only apply to the first push because I need the return value of the second push to be the value of the @L. Remember, @L is recording the byte that starts each line. @C is the list of bytes.

In addition, map{push@L,push@C,lc=~/./g}for 0,<>; also didn't work. It puts 1 as the first element of @L, and 0 as the first element of @C. *shrugs*

However, we can add a character, going back up to 327, and get it right:

@L=(0,map{push@C,lc=~/./g}<>};
---- Results in ----
@L=(0,map{push@C,lc=~/./g}<>};sub p{$_=pop@n}sub w{push@n,@_}while($n<
+@C){$_=$C[$n++];if(/h/){p;w$n[-1-abs];$_>0&&splice@n,-2-$_,1}if(/n/){
+w 0;$b<0||w$b+7*p while($b=index"htaoinse",$C[$n++])<7}$0=p,p,w int$_
+/$0,$_%$0if/e/;$a=p,p&&($a?$n=$L[$a-1]:last)if/t/;/a/?w 1+grep$n>$_,@
+L:/o/?print chr p:/s/?w-(p)+p:/i/&&w ord getc||-1}
[download]

Update: Make that 326 again.

@L=(0,map{push@C,lc=~/./g}<>};sub p{$_=pop@n}sub w{push@n,@_}while($n<
+@C){$_=$C[$n++];r,w($n[-1-abs]),$_>0&&splice@n,-2-$_,1if/h/;if(/n/){w
+ 0;$b<0||w$b+7*p while($b=index"htaoinse",$C[$n++])<7}$0=p,p,w int$_/
+$0,$_%$0if/e/;$a=p,p&&($a?$n=$L[$a-1]:last)if/t/;/a/?w 1+grep$n>$_,@L
+:/o/?print chr p:/s/?w-(p)+p:/i/&&w ord getc||-1}
[download]

------
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Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.

Received! Only two bytes because first push now counts number of elements in @C not pushes elements itself.

@a1=@a2,@a3 doesn't work :( parentheses needed