וַעֲמָשָׂא לֹא נִשְׁמַר בַּחֶרֶב אֲשֶׁר בְּיַד יוֹאָב וַיַּכֵּהוּ בָהּ אֶל הַחֹמֶשׁ וַיִּשְׁפֹּךְ מֵעָיו אַרְצָה וְלֹא שָׁנָה לוֹ וַיָּמֹת
M'tzudos says this means he stabbed him in the fifth rib. He needed to stab him but once to kill him.
Do those who strike in that place accurately strike the right spot to kill?
I mean if I want to kill someone I wouldn't bother to strike him in the rib. I'll strike anywhere. Anything would work. So does 5th rib killing has a special meaning?
I sometimes wonder if I were the translator. Should I translate חֹמֶשׁ as stomach or literally as the 5th rib? I was asking if there is some gematria or kaballah meaning in people getting stabbed on the 5th rib, rather than 4th, 6th, etc.