Another painful (well, not that painful actually) finding

Archived from groups: alt.games.diablo (More info?)

The trade window ate my iron golem, twice.

Since my iron golem skill came from equipment and open/close trade window
will unequip/requip your items, hence my iron golem died both time.

Strange thing is, iron golem survived when I press weapon switch (iron golem
skill came from weapon1 and no weapon on weapon2)