This was inspired by Fr. Mark Goring's "Sudden attack" video.
The panther represents a sudden temptation, that was relatively unexpected. The three men deal with this sudden temptation in different ways- though only one of them comes out victorious, as you know if you watched the video. The first man is a sluggard. He puts down his weapon's just because he doesn't want to bother carrying them. He doesn't pay attention, and doesn't care much if he is "attacked"- in fact, the thought probably hasn't even crossed his mind. Then he is attacked. And he hardly realizes what is happening until it's too late.
The second man has been called in the title a "coward", but he is more of a worrier than a coward. He is always worrying about attacks, fearing, and not trusting God. Every little noise is a possible attack, but he overreacts to each of them. When he does come across a sudden attack, he panics, and in that time is taken down.
And the last man (Jeff is his name) is alert, but not afraid. He is calm and vigilant. When he comes across the beast, he stays calm, doesn't panic like the "Coward" did. He immediately looks to Christ, and is able to defeat the beast by the power of God.