blob detect when gone

Can’t wrap my head around this:

when a blob is no longer detected it no longer exists, hence there is no position data for that blob. I need my last positional data for that blob to LAG (interpolate) to position (0,0), but I cannot figure out a way to make a chop network that will trigger the value (0,0) as soon as a blob no longer exists. Tried various combos of MATH,ENV, etc… any ideas to point me in the right direction ? I’m sure it’s something pretty straightforward that I haven’t learned yet.

summary: how to make the death of a blob interpolate from last reported position to position 0,0

regards,
c.o’d

maybe lag chop could help