Wasp attacking spider

[Words]

It's the first time I've seen this, but I was watching a small spider happily dealing with a large fly, when it was attacked by a wasp. The wasp clearly had the upper hand in proceedings, but eventually flew off dropping the spider. Could this have been a wasp laying an egg parasitically?

Here's one picture. A longer sequence is on my blog.

[Venger]

Spider is a Theridiidae, a comb footed spider, looks like a Enoplognatha ovata.

The wasp looks like a common wasp (that said I'm not up on my wasp's) - so unlikely to be parasitic egg laying - looks like predatory attack.

[Words]

Thanks Venger!

[eucera]

The wasp is Vespula vulgaris and it is predatory rather than parasitic