Yeah fair enough -f -s does the same thing as -t 0?

Straight from the doc

/t <xxx> Sets the time-out period before shutdown to xxx seconds. The valid range is 0-315360000 (10 years), with a default of 30. If the timeout period is greater than 0, the /f parameter is implied.

If -t is specified -f is assumed and redundant, but also it will try to do graceful l, but with a patience of a cranky toddler