Plot-The Doctor is injured and unable to find his TARDIS. The Master see this as his chance , but when he finds the Doctor, he sees the Doctor is suffering and ends up hurting him worse. 
But when the Doctor cant barely move will the Master ever stop. 

MAster - [img=http://media.tumblr.com/tumblr_lr9nm9uH6F1qknbv6.gif]  [img=http://i40.tinypic.com/c2s6c.jpg]