So when is the last chance you can Rez an asset during a run before being accessed? Case in point I want the runner to spend as much resources as possible to find out about Thomas Haas, when can I Rez him and use him before the runner can access him?

Note: Sorry about the topic used my tablet to post meant to say Rezzing, go team autocorrect.

Step 4.3 in the updated timing structure (see FAQ), after the runner has decided to continue the run after passing the last piece of ice, but before the run is considered successful.