in their hour of need

またまたbeheadingが行われました。「鬼畜」ということばしか思い浮かびません。

Video: Islamic State Group Beheads British Hostage

Britain has been supporting U.S. military efforts against the Islamic State group by using British forces to help with logistics and intelligence gathering, as well as recently taking part in airstrikes in Iraq. The Internet video released Friday begins with a news clip announcing British strikes against the Islamic State group.

British Prime Minister David Cameron said Henning's apparent slaying showed "how barbaric and repulsive these terrorists are."

"Alan had gone to Syria to help get aid to people of all faiths in their hour of need," Cameron said in a statement. "The fact that he was taken hostage when trying to help others and now murdered demonstrates that there are no limits to the depravity of these ... terrorists.

"We will do all we can to hunt down these murderers and bring them to justice."

http://abcnews.go.com/International/wireStory/video-purports-show-islamic-state-beheading-25952064

in one's hour of needは、「困っている時に、難局にいる時に」というイディオムで、hourは「時間」を比喩的にとらえています。何もできないのがもどかしい思いです。（Inaho）