Its better to hold a meeting with the team, to clarify what the grenade is, check all possible outcomes, investigate every tiny detail by which time everyone is dead. Key point is everyone
This was also my experience working for a US subsidiary of a Japanese multinational.
They do things very very deliberately. Which in some fields is a good thing. But that doesn't work all that well when competing against companies that "move fast and break things". Or even against companies that operate at a non-glacial pace.
Occasionally I would have loved to scream: "JUST MAKE A FUCKING DECISION!" But that's not generally part of their culture.
To be fair, there were also maverick groups within the company that did move fast and were able to compete quite successfully. But they were the exception.