Run for it.

You decide that whatever that thing is, you want to get away from it right now. The moment you start to bolt, it lunges at you. It kind of seems like it's sensing your movement. Already invested in running, you hope your sudden dash gets you clear of it's reach.

You look back to see that it's nowhere near close enough to grab you, though it seems to be slowly getting longer. All the same it doesn't look to have a chance of catching you with how quickly you're leaving it behind. You turn your head to look forward a moment too late however, ahead of you a mass of smaller tendrils is squirming ahead of your feet, causing you to trip. You can see them flailing towards you out of the corner of your eye.