Apparently, it was too soon to start training after the half marathon. The body felt fine, so I just did a light and short session due to lack of time and still, later on that night woke up with a very slight throat infection.

snatch @20kg x1min e.s @16rpm, rest 1min
snatch @20kg x2min e.s @16rpm, rest 2min
snatch @20kg x3min e.s @16rpm, rest 2min
half snatch @22kg x1min e.s @16rpm, rest 2min
Jori swings @2*4kg x50 .es

Moral of the story: even if you feel ready to train, after a new PR, rest for more than a couple days.