In the series Draggin' the line, a quite often quoted text is related to the wishes expressed by Mann that 'it would be nice to try to "contain" the putative "MWP.." . In this occasion, however, I think Mann is completely right to use the word contain.
I really cannot understand why the use of the word contain has been so severely criticized. The Medieval Warm Period is a period of a few centuries, centered around more or less the year 1000, which quite possibly was warmer than the following centuries, say from 1400 to 1800. The duration and geographical extent of the Medieval Warm Period is not very well known. Mann is writing about possible studies to reconstruct, albeit in an approximate manner, the climate of the past millennium. He argues that instead of limiting the reconstruction period to just back to year 1000, it would be nice if they could extend the period of the reconstruction backwards by several centuries, thus perhaps gaining a better understanding of the Medieval Warm Period.
What I cannot understand either is why the Medieval Warm Period was renamed as the Medieval Climate Anomaly. Suddenly, a few years ago, the term MWP started to disappear from the research papers to be be replaced by the term MCA. Perhaps that was another form of, infantile, contention.