Гарри Поттер и узник Азкабана

           "Thefortressissetonatinyisland,wayouttosea,buttheydon’tneedwallsandwatertokeeptheprisonersin,notwhenthey’realltrappedinsidetheirownheads,incapableofasinglecheerythought.Mostofthemgomadwithinweeks."

           "ButSiriusBlackescapedfromthem,"Harrysaidslowly."Hegotaway..."

           Lupin’sbriefcaseslippedfromthedesk;hehadtostoopquicklytocatchit.

           "Yes,"hesaid,straighteningup,"Blackmusthavefoundawaytofightthem.Iwouldn’thavebelieveditpossible...Dementorsaresupposedtodrainawizardofhispowersifheisleftwiththemtoolong..."

           "YoumadethatDementoronthetrainbackoff,"saidHarrysuddenly.

           "Thereare—certaindefensesonecanuse,"saidLupin."ButtherewasonlyoneDementoronthetrain.Themorethereare,themoredifficultitbecomestoresist."

           "Whatdefenses?"saidHarryatonce."Canyouteachme?"

           "Idon’tpretendtobeanexpertatfightingDementors,Harry—quitethecontrary..."

           "ButiftheDementorscometoanotherQuidditchmatch,Ineedtobeabletofightthem—"

           LupinlookedintoHarry’sdeterminedface,hesitated,thensaid,"Well...allright.I’lltryandhelp.Butit’llhavetowaituntilnextterm,I’mafraid.Ihavealottodobeforetheholidays.Ichoseaveryinconvenienttimetofallill.