Either he wasn't thinking clearly, or he does not have enough confidence in himself.
If the later is true, then he should have waved Murphy up, rather than keeping the forwards going through phase after phase, risking knock ons or turn overs at each breakdown.
Nick Evans' last minute drop goal against Stade came after 30 phases during which he (at least twice) turned down the drop goal and ran himself before he finally went for it.
I just think it's possible that there are more than two possible reasons for what happened with Flood.
First, read your penultimate paragraph again. Nick Evans dropped the goal, he didn't stand aside for Mike Brown to take it, nor look for orders from Will Skinner.
Second, check the Tigers board. They all acknowledge that Flood hates taking drop goals, and is no good at it. There's even a thread on whether its due to his legs being too long!!!!
The fact is, its an acknowledged weakness in his game which a 10 can't afford to have at international level. Think 2003 RWC final for a start.
You may optionally give an explanation for why this post was reported, which will be sent to the moderators along with the report. This can help the moderator to understand why you reported the post.