as my view in this subject,i need clarity in few things, that NS pairs r regular parts r not,if they reg.partners means third seat calls need to be alerted in must. other aspect of east's pass, he had A10x of hearts, so when he dbl and ...
the way 2Dmulti i use is weak in a major r 20-21 with a 5card major(so normal 2nt opening is 20-21without 5card major-and u can use smolen where puppet stayman users can't use smoelen)now lets comes to ur question. 2D-(dbl)-redbl is little quiet complicated with ...
first 3nt bid looks bad--easy 6nt can be ON.so even after 4D by opp over 3nt - 4nt/5nt looks very simple--2C overcall withAKQ10xx/x(6/7cards)and spade Qjx top 11/12 tricks-so after 2C i bid 4nt quanti first.