Wasittoescapeanylackofconcentrationwhichthesesamememoriesmightbring，thatheroseandsteppedtothewindow?Orwasitunderoneofthoseinvoluntaryimpulseswhichmoveusinspiteofourselvestodotheverythingourjudgmentdisapproves?
NosoonerhadheapproachedthesillthanMr。Brotherson’sshadeflewwayupandhe，too，lookedout。Theirglancesmet，andforaninstantthehardydetectiveexperiencedthatinvoluntarystagnationofthebloodwhichfollowsaninnershock。Hefeltthathehadbeenrecognised。Themoonlightlayfulluponhisface，andtheotherhadseenandknownhim。Else，whytheconstrainedattitudeandsuddenrigidityobservableinthisconfrontingfigure，withitspartiallyliftedhand?AmanlikeBrothersonmakesnopauseinanyactionhowevertrivial，withoutareason。Eitherhehadbeentransfixedbythisglimpseofhisenemyonwatch，ordaringthought！
hadseenenoughofsepulchralsuggestioninthewanfacelookingforthfromthisfatalwindowtoshakehimfromhiscomposureandletloosethegrinningdevilofremorsefromitsironprison-house?
Ifso，themovementwasamemorableone，andthehazardquiteworthwhile。Hehadgained-no！hehadgainednothing。Hehadbeenthefoolofhisownwishes。Noone，letaloneBrotherson，couldhavemistakenhisfaceforthatofawoman。Hehadforgottenhisnewly-grownbeard。Someothercausemustbefoundfortheother’sattitude。Itsavouredofshock，ifnotfear。Ifitwerefear，thenhadherousedanemotionwhichmightrebounduponhimselfinsharpreprisal。Deathhadbeenknowntostrikepeoplestandingwherehestood；mysteriousdeathofaspeciesquiteunrecognisable。
Whatwarrantyhadhethatitwouldnotstrikehim，andnow?None。