force slide rule?

[rbmartin]

Here is my basic rule of thumb (OBR/Babe Ruth):
a) Fielder recieving accurate, inflight throw + normal collision = Interference (out)
b) Fielder with ball + intentional, violent collision = Malicious contact (out & ejection)
c) Fielder recieving errant throw + collision = train wreck (play on)
d) Fielder retreiving errant throw or missed ball + collision = "type A" obstruction (immediate dead ball / runner advances)

a & d would be somewhat different for FED rules.