Roleset imperil.01 Verbnet Class: NONE "put into danger":

Roles:

Arg0:causer of danger (agent or instrument)


Arg1:entity in danger

Examples:

passive (-)
It is possible then that Santa Fe's real estate -- even in a state imperiled *trace* by earthquakes -- could, one day, fetch a king's ransom.
REL:	imperiled
Arg1:	*trace* -> a state
Arg0-by:	earthquakes

If we see any examples with both agent and instrument, arg0 will have to be split into arg0 'agent' and arg2 'instrument' and all sentences will have to make the distinction. Otherwise let's not.