Projectile shield stun formula dmg/3.5+2
Metal blade has 4 frames shield stun when z dropped.
Up air, 3 frames shield stun on all hits.
first hit up air on frame 11
Up air has 19 frames landing lag
perfect up air on sheik hits 5 times on a full shield
Up air rehit rate is 3 for first 3 hits and 5 for the next two
projectiles dont cause hitlag so we dont have to worry about that
Now that we have that data let me describe the scenario. Lets assume one hit of metalblade, and we catch it with up air and everything is perfect. We will call frame one the frame when metal blade hits shield and we will say that we catch it the first possible frame because we are gods. Spacing the up air all depends on where you start the up air and where you fast fall so im gonna pretend we dont need a fastfall because for this it doesnt matter. Also of course you must be facing away for the metal blade to hit after z drop.
Format: Frame number / Megaman Action / Megaman status / Sheik status / active projectile status
1 / nothing / wait (aerial) / Shield hit (metalblade) Shieldstun (1) / Metalblade hit
2 / Up air / start up air (1) (catch metal blade) / Shieldstun (2) / Metalblade grabbed
3 / nothing / up air (2) / Shieldstun (3) / nothing
4 / nothing / up air (3) / Shieldstun (4) / nothing
5 / nothing / up air (4) / Wait (shield) / nothing
6 / nothing / up air (5) / Wait (shield) / nothing
7 / nothing / up air (6) / Wait (shield) / nothing
8 / nothing / up air (7) / Wait (shield) / nothing
9 / nothing / up air (8) / Wait (shield) / nothing
10 / nothing / up air (9) / Wait (shield) / nothing
11 / nothing / up air (10) / Wait (shield) / nothing
12 / nothing / up air (11) / Shield hit (up air) Shieldstun (1) / up air active (11) hit (1)
13 / nothing / Landing lag (up air) (1) / Shieldstun (2) / up air active (12)
14 / nothing / Landing lag (up air) (2) / Shieldstun (3) / up air active (13)
15 / nothing / Landing lag (up air) (3) / Shield hit (up air) Shieldstun (1) / up air active (14) hit (2)
16 / nothing / Landing lag (up air) (4) / Shieldstun (2) / up air active (15)
17 / nothing / Landing lag (up air) (5) / Shieldstun (3) / up air active (16)
18 / nothing / Landing lag (up air) (6) / Shield hit (up air) Shieldstun (1) / up air active (17) hit (3)
19 / nothing / Landing lag (up air) (7) / Shieldstun (2) / up air active (18)
20 / nothing / Landing lag (up air) (8) / Shieldstun (3) / up air active (19)
21 / nothing / Landing lag (up air) (9) / Shield hit (up air) Shieldstun (1) / up air active (20) hit (4)
22 / nothing / Landing lag (up air) (10) / Shieldstun (2) / up air active (21)
23 / nothing / Landing lag (up air) (11) / Shieldstun (3) / up air active (22)
24 / nothing / Landing lag (up air) (12) / Wait (shield) / up air active (23)
25 / nothing / Landing lag (up air) (13) / Wait (shield) / up air active (24)
26 / nothing / Landing lag (up air) (14) / Shield hit (up air) Shieldstun (1) / up air active (25) hit (5)
27 / nothing / Landing lag (up air) (15) / Shieldstun (2) / up air no longer relevant
28 / nothing / Landing lag (up air) (16) / Shieldstun (3) / nothing
29 / nothing / Landing lag (up air) (17) / Wait (shield) / nothing
30 / nothing / Landing lag (up air) (18) / Wait (shield) / nothing
31 / nothing / Landing lag (up air) (19) / Wait (shield) / nothing
32 / Jump / Jumpsquat (1) / Wait (shield) / nothing
33 / nothing / Jumpsquat (2) / Wait (shield) / nothing
34 / nothing / Jumpsquat (3) / Wait (shield) / nothing
35 / nothing / Jumpsquat (4) / Wait (shield) / nothing
36 / z drop / Aerial (wait) / Shield hit (metalblade) Shieldstun (1) / Metalblade active (1) hit (1)
?
So here's where things get misty. Metalblade hits 3 times when zdropped immideately after a short hop but i do not know what the refresh rate is. Regardless, We know its fast enough to lock the opponent in shield stun so im gonna guess 4.
37 /
/ start
(1) / Shieldstun (2) / Metalblade active (2)
38 / nothing /
(2) / Shieldstun (3) / Metalblade active (3)
39 / nothing /
(3) / Shieldstun (4) / Metalblade active (4)
Honestly this is tedious and there isnt anypoint in continuing so Sheik is locked in shield for another 8 frames by metal blade, back air hits before then sheik gets shield broken.
So take-aways. This isnt a true block string because of the two 7 frame gaps.
But, Buuuuut, it is still a pretty good option, not as good as raw metal blade pressure but still good nonetheless. Also because you are holding metal blade you can cover rolls with jc metalblade toss.