Fate/Zero

[Ryllharu]

You make it sound like Saber will run out of mana/prana. She's being properly supplied by Kiritsugu, it's not like the 5th War. Excalibur is draining, but it's not going to put her at a huge disadvantage. She just can't fire it in succession, plus it takes a while to charge.

It's like Lina Inverse's Dragon Slave from the movies (not the Slayers tv series where it is used comically). Actually, the special effects used in this episode make it appear very similar to the movie kind.

[Buffalobiian]

You make it sound like Saber will run out of mana/prana. She's being properly supplied by Kiritsugu, it's not like the 5th War. Excalibur is draining, but it's not going to put her at a huge disadvantage. She just can't fire it in succession, plus it takes a while to charge.

I think she will given the following conditions:

1) Both masters have the same amount of mana reserve to supply their servants
2) Both servants only obtain mana from their one master
3) Both servants use mana at a rate that is faster than that which can be regenerated by their master
4) Both servants engage in a materialised, equally matched fist fight only
5) Both servants burn equal amounts of mana pts/second during this fight.

[Xelbair]

1) Both masters have the same amount of mana reserve to supply their servants
2) Both servants only obtain mana from their one master
3) Both servants use mana at a rate that is faster than that which can be regenerated by their master
4) Both servants engage in a materialised, equally matched fist fight only
5) Both servants burn equal amounts of mana pts/second during this fight.

1) Flase - it is not the same amount - you've got rogue magus vs archmagus here.
3) true - but only in combat(with one obvious exception in F/SN).
5) false - saber uses mana burst with her attacks - which drain A LOT more mana in exchange for massive bonus to strength of the attack.