https://www.instagram.com/p/BIaRSR2AsYZ/?igshid=1bjnja18lg0n6
https://www.instagram.com/p/BIaK02hgf2j/?igshid=ormqj9sq68n9
I hope that gives the general idea of the shake.^
You could also use ampersand followed by a number of zooms on the one line so it shakes whilst the action of the characters happens:
&zoom on x y to % in s THEN zoom on x y to % in s THEN zoom on x y to % in s etc etc
@CHAR1 walks to spot s x y in zone # in s AND CHAR2 walks to spot s x y in zone # in s THEN CHAR1 starts animation AND CHAR2 starts animation AND CHAR1 faces left/right AND CHAR2 faces left/right
You could also slightly delay the shake:
&pause for s THEN zoom on x y to % in s THEN zoom on x y to % in s THEN zoom on x y to % in s etc etc
@CHAR1 walks to spot s x y in zone # in s AND CHAR2 walks to spot s x y in zone # in s THEN CHAR1 starts animation AND CHAR2 starts animation AND CHAR1 faces left/right AND CHAR2 faces left/right