The reason behind this statement is that TX2 can only be signed by Bob once he receives the second output of TX1. Therefore, Bob does not have to worry about Alice closing the channel with TX2. The message seems to be addressed to someone named Nicolas, but there is no further information available regarding their identity or involvement in the discussion.It is unclear what the specific context of the conversation is or what the implications of this statement may be. However, it appears to be related to some sort of transaction or agreement between multiple parties. The use of technical terminology such as "TX1" and "TX2" suggests that this may be a discussion related to cryptocurrency or blockchain technology.Without more information, it is difficult to fully understand the significance of this statement or its potential impact on the situation at hand. It is possible that further clarification or context would be necessary to fully comprehend the meaning behind this message.