then beren thrust swiftly upward with a spear into his throat , and huan leapt again and had him by a hind leg , and karkaras fell as a stone , for at that same moment the ting 's spear found his heart , and his evil spirit gushed forth and sped howling faintly as it fared over the dark hills to mandos ' ; but beren lay under him crushed beneath his weight .