 Boundary-point swallowing time for a Loewner chain

For a real point $b$ away from the initial driver, this is the maximal lifetime of the real solution ${\partial }_t{g}_t(b)=2/(g_t(b)-{\xi }_t)$. At finite lifetime its centred image collides with the Loewner driving function. A point may be visited or separated from infinity by the hull, so swallowing is not the same as an individual trace visit.