1 does a stealthy character still block line of fire to friendly characters behind them?

2 do defensive powers affect knockback damage?

3 can big figures like sinestro be affected by team powers like shields damage enhancement?

will i ever find a more efficient piece than my V taskmaster!?

1: Yes, (unless the figure behind them is soaring) hard though it is to believe, something a figure can not see, stops it seeing what is behind it. Not to legical really but that's just the way the rules work.

2: I am guessing you mean toughness and the like. Turn the clicks for the initial damage and then do the knock back damage seperately, if toughness is shown on the dial at this time it reduces the knock back damage by 1.

3: Never played him so I better not hazzard a guess.

will i ever find a more efficient piece than my V taskmaster!?
U The Leader, best 113 points you will ever spend.

Also, stealthed (and also non-stealthed) figures do not block line of sight from an elevated figure to a grounded figure, and vice-versa.

BarryAllen, did u say The Leader!? best 113 pts ull ever spend?! wow! IMO The Leader is by far one of THE worst figures in the game

I have found E Taskmaster, to serve me better than V.