常不易(yì )便要求大家(jiā )提高(gāo )警(jǐng )惕(tì ),以防止(zhǐ )敌人会(huì )从金剑阁周围陡峭的悬崖(yá )上(shàng )冒(mào )险攻(gōng )上来。就在他刚刚下(xià )达了这道命令,第二道关卡(kǎ )上也蹿起了一支响箭。见到这支响箭,他(tā )将一只手握(wò )成拳(quán )头(tóu ),在另一只手(shǒu )的掌心中(zhōng )捶(chuí )了(le )一下(xià ),满脸(liǎn )悲痛地说:“坏了,第一道关卡的弟兄遇难(nán )了。”