Pretty simple question, and I think I know the answer-
Player A has a Vexing Shusher in play. Player A plays a 2cc spell, passes priority. Player B declares Mana Drain targeting Player A's 2cc spell. Player A responds by activating Vexing Shusher's ability.
Question: Does Player B get 2 colorless mana in their manapool at the beginning of their next mainphase?
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Mana Drain
Color= Blue Type= Instant Cost= UU LG(U1)
Text (LG+errata): Counter target spell. At the beginning of your next main phase, add

to your mana pool, where X is that spell's converted mana cost. [Oracle 2003/07/01]
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Vexing Shusher
Color= Multi Type= Creature - Goblin Shaman Cost= (R/G)(R/G) SM(R)
Text (SM): 2/2. ; ~this~ can't be countered. ; {R/G}: Target spell can't be countered by spells or abilities.
I think so, as the second clause in Mana Drain is not predicated on the first. However, confirmation/correction would be greatly appreciated.