I fixed a bug where THROW (and HURL and LOB) would unhide the target 100% of the time - even without SPOT effect. Looks like someone broke it back before 3.0 work began, and it slipped in when things went live a year ago :( Let me know if you see any problems with the change.
"I have no data yet. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories instead of theories to suit facts."
- Sir Arthur Conan Doyle, Sherlock Holmes