This ant is in some serious trouble. It’s caught in a spider web.
Its struggling has alerted the spider to its presence. The spider didn’t just jump out at the first hint of motion in its web; spiders know that the prey isn’t going anywhere (and if it is going somewhere, it’s probably too big to be prey).
The spider bears down on the ant.
The spider pulls back while its bite takes effect.
Then it bites again.
Then it pulls back again.
Then it just waits. I’m not sure if it eventually ate the ant or just decided that it didn’t taste good.