Hmm, let's see.
It tends to swing for the ground, meaning ducking could be a death wish
Grabbing onto the club is probably death
Backpedaling is probably the most reasonable answer.
I dunno, Gajin
I need more info.
What angle is it swinging in, how fast, how large the club is, etc.
If directly horizontal, flatten self against ground (Duck)
If at an angle, back away (Backpedal)
If moving slowly and small enough for me to get onto, grab the club.
Oh and start shooting again afterwards.