blood puddles. they have different behaviour based on the material they are on. two examples:
snow (1/2)
as you can see snow is melting and the fabric needs to absorb the blood first. i've also seen blood react differently on floor tiles & wood, running through the grooves, fitting material & structure underneath. this game is a whole new level in so many ways...
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notice the dismemberment + i think the hand placement isn't part of a fully scripted animation, it's pointing towards the wound in realtime.