Let his guard down, get distracted by the sight of Chuck climbing the spider like a ladder...the narration makes a noncommittal, wiggly hand motion.

Alistair's eyebrows fly up. Chuck gets a fleeting grin -- as they might say in another world, he likes the cut of your jib, sir -- before he yells and doubles down on his attacks, hard. Anything he can do to keep the spider's attention on him? He's going to do it.