code/datums/ai/basic_mobs/basic_ai_behaviors/ventcrawling.dm 
| /datum/bt_node/subtree/consider_venting | uhm...sus? |
|---|---|
| /datum/bt_node/ai_behavior/enter_vent | Enters a vent stored in entry_vent_key. Sets BB_EXIT_VENT_TARGET and BB_VENT_ENTRY_TIME on success. |
| /datum/bt_node/ai_behavior/exit_vent | Waits inside a vent for a randomised duration, then exits. Handles the give-up timeout. |