﴿ فَنَادَوْا۟ صَاحِبَهُمْ فَتَعَاطَىٰ فَعَقَرَ ﴾

“But they summoned their [boldest] companion, and he ventured [upon the evil deed], and cruelly slaughtered [the animal]:”

But they called their companion Qudār to slay it so he took he drew his sword and he hamstrung with it the She-camel in other words he slew her in compliance with their wish.