A developer is unable to work on their tasks within an iteration, because senior management is constantly pulling them into production incident analyses.
This is a blocker because the developer is unable to work on tasks within the iteration due to external interruptions (senior management pulling them into production incident analyses), preventing the team from progressing.
The offshore testing team is pulled away at the last minute from a high-profile initiative and testing cannot be resumed until a new testing team is assigned.
This is also a blocker because the offshore testing team has been pulled away at the last minute, causing a halt in testing until a new team is assigned. This delay impedes progress and prevents the team from moving forward with their work.