[theblitz]

[ QUOTE ]
This is actually a little known rule of Holdem. Not sure what you could search for to find old posts about this so maybe someone can explain better. I don't know why, but I know it is a rule.

[/ QUOTE ]
You are correct.

An all-in raise less than the minimum raise is not considered a raise and cannot be re-raised by the original bettor unless another player raised.

So, for example, EP bet 100, MP pushes in his 134. If LP just calls 134 then EP can only call.
However, if LP raises then EP can re-raise. LP is allowed to raise here because his bet is based on the EP.

There are some places where the "cut-off" is 50% of the required minimum. So, in the case above, if MP pushes 151 and LP calls then EP is allowed to re-raise.