Zack gets into trouble on an almost daily basis, so his food supply is heavily restricted as a punishment. As a result, he (like Michael) is underfed.
"Oh, that this too, too sullied flesh would melt, / Thaw, and resolve itself into a few, / Or that the Everlasting had not fixed / His canon 'gainst self-slaughter! O God, God!" (I.II.129)
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This would be interesting for practising drawing neck and jaw lines...
Shake it out.