I have a note on the original limper saying he "may call light" if that helps.
It"s unusual for a decent reg to open limp, what is his limping range, does he open limp often?
If as I suspect, this is a turbo, in <5 mins we have 15 bb"s, we don"t really have a lot of opportunity to find a better spot but that has to be weighed against the likelihood of mp1 open limper having us crushed.
Mp1 has 4x 15-18bb stacks on his direct left and if decent could very well be limp trapping a monster. If mp1 is a passive 18/8 I jam whereas versus a more aggro 18/16 I"d be cautious and see a flop with a no set no bet plan.